Sound
What is that sound?
Do Now
1.
8.
7.
6.
5.
4.
3.
2.
9.
10.
Sound
What will you know?
Overview
Sound
By the end of the lesson, I should….
Learning Objectives
Sound
Add definitions to your keywords as you go.
Keywords
Sound
The 4 principles of the particle theory of matter are:
Starter
Sound
There a 3 states of matter:
Title: The Particle Theory
Before you start:
Use pencil
Particles should be the same size
Particles should not be too big or too small
Show what the particles are doing using arrows and lines
Sound
Draw a diagram with to show particles in each state of matter
Starter
Sound
In your notebooks, write down as many kinds of waves that you can think of.
Do Now
Some you might have thought of �(and maybe some you didn’t…)
Sound
What are the two types of waves?
Starter
Sound
What is a transverse wave?
Task 1
Vocabulary:
A wave crest is where particle distance from its original position is a maximum.�
A wave trough is where particle distance is minimum.
Energy is moving perpendicular (forward) to particles (upwards).
Rest position
Amplitude – the height of the wave. Measure from rest position to crest or trough
Wavelength – the distance from one crest to the next crest (or trough to next trough)
Sound
Describing a wave
Task 1
1
2
3
4
Sound
Longitudinal Waves
Task 1
Vocabulary:
A rarefaction is where particle spacing is maximum�
A wave compression is where particle spacing is minimum.
motion of the particles is parallel to the motion of the wave.
Vibrating objects move back and forth.
When it moves forward, gas particles get pushed together. This is called compression
Compression
(High density area)
Rarefaction
(Low density area)
Rarefaction
(Low density area)
Sound
When does a compression occur?
Task 2
When the vibrating object moves away, the air particles can spread out again.
This is called rarefaction.
Compression
(High density area)
Rarefaction
(Low density area)
Sound
When does a rarefaction happen?
Task 2
This happens quickly over and over again.
Compression
(High density area)
Rarefaction
(Low density area)
Rarefaction
(Low density area)
Compression
(High density area)
Sound
See if you can create several compressions and rarefactions.
Sound
Modelling Sound Waves
Practical Task 2
Sound
What do you know about sound?
Task 1
A sound begins with a vibration
Sound
Make a vibration
Task 1
We can produce these vibrations by :
Sound
Find an object from your belongings to make a sound
Task 2
We know that gas particles in the air are easily __________.
compressed
(squashed together)
Challenge: What does this have to do with sound waves?
Sound
Vibrations make waves
Task 2
This shows sound waves carry energy!
Kinetic or potential?
Sound
A sound has moving particles
Demonstration
Sound
In what direction can waves travel?
How do waves move?
Yes! Sound travels faster and further through a liquid than it does a gas.
Sound
Can sound waves travel through liquids?
How do waves move?
Do you remember playing with these?
Your voice sends vibrations from one end to the other.
YES!
Sound
Can sound waves travel through solids?
How do waves move?
Sooo Snnnneaky.
Snakes don’t have ear openings like we do, but can hear by sensing vibrations from the ground.
Sound
Snakes do not have ear openings
Did you know?
How do waves move?
No!
WHY?
There are no particles in a vacuum.
Can sound waves travel through a vacuum?
WHY?
Think about the density of each state of matter.
Sound
How does the medium (state of matter) affect the speed of sound?
Sound
Seeing and Visualising Waves
?
How to perfect the drawing of a sound wave..
Starter
What is an oscilloscope and what does it do?
Rest position
Amplitude – the height of the wave. Measure from rest position to crest or trough
Wavelength – the distance from one crest to the next crest (or trough to next trough)
Sound
Describing a wave
Task 1
1
2
3
4
Sound
What is pitch?
Pitch – the highness or lowness of a sound – is determined by the frequency of the sound.
Loudness of a sound is determined by the amplitude – how far do the molecules move from their original position (size of the wave). �
Sound
What is loudness determined by?
Sound
How does the wave effect the sound?
Sound
Complete the worksheet
Sound
What is Frequency?
We could also ask: How many cycles does this wave complete each second?
Sound
What is the time period?
We could ask: How long does it take for one complete repetition (or cycle)?
This is called period – the length of time that it takes for one full cycle to complete. It is usually given the symbol ‘T’ and is usually measured in seconds.
Sound
Period and Frequency
The speed of a wave through an unchanging medium is constant
Sound
Period and Frequency worked example
2) A singer hitting a high C has a period of about 1.91x10-3 s. Calculate the frequency of this note.
Sound
Period and Frequency worked example
Sound
Period and Frequency
Sound
The speed of sound through different mediums
Sound
Calculating the speed of sound waves
Sound
Examples.
Sound
Examples.
Sound
Examples.
Example 1
Example 2
Sound
Worked Examples
Sound
Worked Examples
Amplitude measures how much energy is in the wave.
Big amplitude = BIG SOUND
Sound
How does amplitude effect sound?
Sound
How does amplitude effect sound?
Amplitude determines LOUDNESS!
An amplifier increases the amplitude of sounds.
Sound
What is loudness?
low frequency = low pitch
high frequency = high pitch
Long/large wavelength means…
Short/small wavelength means …
Wavelength and frequency
What is frequency
The pitch depends on how many vibrations there are.
The more frequent the vibrations the higher the note.
The fewer the vibrations the lower the note
Sound
How does frequency affect sound?
The higher the note, the more waves per second so the waves are squashed together.
The waves will have a short wave length.
Guess the sound
?
Sound
How does frequency affect sound?
The lower the note, the FEWER waves per second so the waves are spread out.
The waves will have a longer wave length.
Sound
How does frequency affect sound?
Mouse’s squeak: Low amplitude
High freq
Lion’s roar: High amplitude
Low freq
?
?
high or low?
?
?
Sound
Fill in the missing words
Checkpoint
Sound
Summary
Sound
What is an echo?
The frequency range of humans is from 20Hz to 20,000Hz.
Below 20Hz are infrasounds, above 20,000 are ultrasounds.
Sound
What is hearing range?
Sound
What is ultrasound?
Sound
What are some uses of ultrasound?
Reflected ultrasound are sent detected and sent to a computer
Computer changes ultrasound signal into an image
Sound
What are some uses of ultrasound?
Many uses of science have moral and ethical issues.
Sound
Sound
Ultrasound scans – Good or bad?
Sound
Hearing and Deafness
When a sound is made, the air around the sound vibrates.
Hearing starts when some of the sound waves funnel into the ear.
Sound
How do we hear?
Sound
How do we hear?
Sound
How do we hear?
1. Ear flap (Pinna)
2. Ear canal
3. Ear drum
5. Anvil
6. Stirrup
7. Cochlea
4. Hammer
8. Eustachian tube
9. Auditory nerve
Sound
Parts of the ear
Outer Ear - The earflap and the ear canal
Collects and directs the sound waves to the middle.
Sound waves go directly or get reflected into the auditory canal.
Ear wax in outer ear can stop sound waves from reaching the middle ear.
A human ear has 3 parts:
outer ear, middle ear, inner ear
Sound
Parts of the human ear
Middle Ear – eardrums and 3 ear bones
Changes energy of sound waves into vibrations.
Sound waves reach eardrum and makes it vibrate.
The vibrations cause the hammer, anvil and stirrup (the three ear bones) to vibrate.
High energy waves from loud sounds can tear a hole in the eardrum
Sound
Parts of the human ear
OUCH!
Sound
Ouch
Inner Ear – cochlea, Eustachian tube, auditory nerve
Changes vibrations into nerve impulses and send them to the brain.
Vibrations from ear bones travel through a liquid and to the cochlea.
Cochlea is lined with 20,000 tiny hair-like nerve cells.
Each nerve cell has different length and detects a different frequency of sound.
The tiny “hairs” are damaged by loud or constant noise. Be careful! Once you lose them, they never grow back!
Sound
Parts of the Human Ear
Nerve cells on the hairs detect this movement.
They send signals to the brain.
You hear the sound.
Tiny hairs – cilia – hang down into the liquid. Vibrations travelling through the liquid push the hairs.
Sound
What are the tiny hairs in our cochlea?
Sound waves are focused by the pinna and enter the ear canal.
The ear drum vibrates.
In the cochlea, vibrations are changed into electrical messages
The auditory nerve passes the electrical messages to the brain
The vibrations are passed on by the anvil, hammer and stirrup
We hear the sound.
Sound
Summary of how we hear
Activity – put these in the correct order
1. Sound waves are focused by the pinna and enter the ear canal.
2. The ear drum vibrates.
4. In the cochlea, vibrations are changed into electrical messages
5. The auditory nerve passes the electrical messages to the brain
(Semi-circular canals are for balance)
3. The vibrations are passed on by the anvil, hammer and stirrup
6. We hear the sound.
Sound
Summary of how we hear
Activity – put these in the correct order
What is this?
Why is it not good for this?
Sound
Hearing and Deafness
The vuvezela is a horn that is popular at football matches in Africa. It creates a loud noise, but how loud?
Loudness is measured in decibels (dB)
faint
moderate
loud
very loud
painful
0
20
40
60
80
100
120
140
160
dB
whisper
alarm clock
lawnmower
chainsaw
conversation
jet engine
right next to the speakers at a rock concert
Where do you think those go on the decibel scale above?
a vuvezela
Sound
Hearing and Deafness
Any sound that is unwanted is called noise.
Sound
Decibel scale
Sounds louder than 80 decibels are considered potentially dangerous.
Sound
Decibel scale
Take care
of me!
X
Sound
Taking care of your ears
Light and Reflection
Why do we see lightning before we hear thunder?
Do Now
Light
What is light?
Starter
Light carries energy and travels as a wave.
Light waves travel in straight lines.
Light travels at a speed of 300,000,000 metres per second, which is much faster than the speed of sound.
Light is produced by the Sun, and by objects such as light bulbs and matches.
Summarise this in 5 words or less
Light
How do we see things?
Task 1
An object that gives out light is described as luminous. How does light from a luminous object such as a light bulb reach the eye?
Light travels in a straight line directly into the eye.
LUMOS!
Make a list of 5 objects that are luminous
Light
How do we see things?
An object that does not give out light is non-luminous. How does your eye see a non-luminous object such as a comb?
Light hits the comb and some of it is reflected into the eye.
Make a list of 5 objects that are non- luminous
Light
How do we see things?
Light
How do we see things?
Light bulb
sun
TV
Light
Answer the following question in your books
Checkpoint
straight
give out
luminous
It gives out light
340
reflect
Light
Are all objects the same?
Task 2
Opaque: no light will pass through
Transparent: all or most of the light passes through
Translucent: some light passes through
Leave some space under each one to draw something!
Light
Answer the following question in your books
Checkpoint
1
2
3
Match 1 2 3 and A, B, C together!
Transparent – these are materials which let all of the light straight through.
Translucent – these materials let light through but it is randomly scattered.
Opaque – these materials let no light through.
clear glass
frosted glass
wood
wine glass
tracing paper
book
brick
cling film
steel
marble ball
pencil
curtains
cardboard
water
Light
Design a table to show whether these objects are transparent, translucent or opaque
Challenge: Can you think of any other objects for each category?
Light
Why do you shadows form?
Task 3
1 Which of these statements is true?
A Light travels in straight lines.
B Light is stopped when it meets a solid object.
C Light does not travel in straight lines.
D Light will only travel for about 2000km before it stops.
Light
Checkpoint
2 Which of these is not a source of light?
A a light bulb
B the Sun
C a mirror
D a TV
Light
Checkpoint
3 Shadows are formed because:
A light will only travel a certain distance before it stops.
B a substance called ‘darkness’ collects behind some objects.
C some objects do not give out light in all directions.
D light cannot go through some objects.
Light
Checkpoint
4 Which statement is true?
A Sound travels faster than light.
B Sound will not travel. Only light can travel.
C Light travels faster than sound.
D Light and sound travel at the same speed.
Light
Checkpoint
5 Objects that light can easily pass through are said to be:
A transparent.
B apparent.
C opaque.
D oblong.
Light
Checkpoint
6 Which phrase best completes the following sentence? We see things because:
A they are luminous.
B the Sun shines on them.
C light from them enters our eyes.
D light from our eyes shines on them.
Light
Checkpoint
7 Opaque objects can:
A transmit and reflect light.
B transmit and absorb light.
C reflect and absorb light.
D only reflect light.
Light
Checkpoint
8 Which of these will absorb the most light?
A a white sheet of paper
B a sheet of clear glass
C a black piece of card
D an orange piece of card
Light
Checkpoint
9. Which of these diagrams show how light rays travel?... There may be more than one that is right!
ANSWERS
Light
Swap your books to mark each other’s answers.
Checkpoint
1 Which of these statements is true?
A Light travels in straight lines.
B Light is stopped when it meets a solid object.
C Light does not travel in straight lines.
D Light will only travel for about 2000km before it stops.
Light
Swap your books to mark each other’s answers.
Checkpoint
2 Which of these is not a source of light?
A a light bulb
B the Sun
C a mirror
D a TV
Light
Swap your books to mark each other’s answers.
Checkpoint
3 Shadows are formed because:
A light will only travel a certain distance before it stops.
B a substance called ‘darkness’ collects behind some objects.
C some objects do not give out light in all directions.
D light cannot go through some objects.
Light
Swap your books to mark each other’s answers.
Checkpoint
4 Which statement is true?
A Sound travels faster than light.
B Sound will not travel. Only light can travel.
C Light travels faster than sound.
D Light and sound travel at the same speed.
Light
Swap your books to mark each other’s answers.
Checkpoint
5 Objects that light can easily pass through are said to be:
A transparent.
B apparent.
C opaque.
D oblong.
Light
Swap your books to mark each other’s answers.
Checkpoint
6 Which phrase best completes the following sentence? We see things because:
A they are luminous.
B the Sun shines on them.
C light from them enters our eyes.
D light from our eyes shines on them.
Light
Swap your books to mark each other’s answers.
Checkpoint
7 Opaque objects can:
A transmit and reflect light.
B transmit and absorb light.
C reflect and absorb light.
D only reflect light.
Light
Swap your books to mark each other’s answers.
Checkpoint
8 Which of these will absorb the most light?
A a white sheet of paper
B a sheet of clear glass
C a black piece of card
D an orange piece of card
Light
Swap your books to mark each other’s answers.
Checkpoint
9. Which of these diagrams show how light rays travel?... There may be more than one that is right!
I still feel unsure. I need some more help to understand.
I feel ok. I need to do some more work to check my understanding.
I am happy and feel I understand and can explain the main points.
:
(
:
)
:
|
(L4) Describe how light travels from luminous sources.
(L5) Explain how we see both luminous and non-luminous light sources.
(L6) Use ray diagrams to show how we see both luminous and non-luminous objects.
Light
Are you now able to…
Checkpoint
AMBULANCE
WE
ARE
LEARNING
ABOUT
REFLECTION
Reflection
Try and draw mirror images of the words:
Do Now
Reflection
Can you decipher the hidden message?
Do Now
Reflection
How could you explain why this is happening?
Starter
Reflection
What types of reflection is there?
Task 1
Mirror
Specular
Diffuse
Why does the image in the reflection look the same?
Reflection
What does this tell us.....
Do Now
Reflection
What objects reflect light well?
Task 1
The Law of Reflection = the angle of reflection is equal to the angle of incidence
Reflection
Write the correct name for each number
Task 2
1.
2.
3.
4.
5.
6.
Reflection
Reflection Experiment
Task 2
You will need:
Method
Created by H Rogerson
normal
Incident ray
Reflected ray
Light
What is the method?
Task 2
What happens when you do each of the following?
Light
Try this…
Task 2
Conclusion
Created by H Rogerson
Light
Conclusion
reflection, changing, normal, measuring, angle, perpendicular, light
I will find out what the relationship is between the _________ of incidence and the angle of _________________. I will do this by shining a ray of ___________ onto the mirror. I will then measure the angles on each side of the ______________ line using a protractor. The normal line is _________________ to the mirror. I will repeat the experiment by _____________ the size of the angle of incidence and ________________ the angle of reflection.
Reflection
Conclusion Support
Task 2
Reflection
Answer the following questions in your books
Checkpoint
Just write the answers
Light
True or False.
Checkpoint
Reflection
How can we use reflection in the real world?
Task 3
The two plane mirrors must be positioned at 45° from the vertical. Light is reflected at right angles from the top mirror onto the bottom mirror and into the eye of the viewer.
How does a periscope use reflection?
Reflection
How can we use reflection in the real world?
Task 3
Reflection can be very useful.
High-visibility strips are very reflective and make sure that this cyclist gets noticed when there is little light.
Reflection
Captain Khan’s Tropical Treasure Hunt
Task 4
Ahoy there me harties! I have buried a hoard o’ treasure somewhere on this tropical island. Use this map and the laws of reflection to find the path.
Only those who listened to their science teacher will be loaded with gold (that’ll teach ya!) The landlubber who comes the closest shall receive the booty.
A word of warning to ya, only fools will climb the doom...
Reflection
A teacher has a small torch. He switches it on and points it towards a mirror.
Exam Question
Exam question:
A ray of light from the torch reflects off the mirror. Use a ruler and protractor to draw the ray of light:
(i) from the torch to the mirror;
1 mark
(ii) reflecting off the mirror.
2 marks
Refraction
Write the correct name for each number
Do Now
1.
2.
3.
4.
5.
6.
1
2
3
Match 1 2 3 and A, B, C together!
Transparent – these are materials which let all of the light straight through.
Translucent – these materials let light through but it is randomly scattered.
Opaque – these materials let no light through.
Refraction
What is happening in each of the photos?
Starter
Refraction
7 Plot the path of the ray of light.
Refraction
Investigating Refraction
| Angle of incidence i | Angle of refraction r | Angle of emergence e |
❶ | | | |
❷ | | | |
❸ | | | |
❹ | | | |
i
r
e
glass block
Refraction
In pairs you need to collect
Everything shown in this diagram plus a protractor!
Refraction
I noticed that the ray of light is refracted (away from/towards) the normal when it goes into a glass block.
The ray of light is refracted (away from/towards) the normal when it comes out of a glass block.
The angle of incidence is (smaller than/equal to/larger than) the angle of emergence.
The angle of refraction is (smaller than/equal to/larger than) the angle of incidence.
WHY did the light bend both as it went into the glass block and as it left the glass block?
Talk to the person next to you about this for 1 minute.
Refraction
Why was the light refracted?
This is because glass is more dense than the air and it slows down the light.
The light ray bends away from the normal again when it travels into air which is less dense.
The light ray bends towards the normal when it enters the glass from the air.
Refraction
Why was the light refracted?
Refraction
Why was the light refracted?
Refraction
Can you now explain what is happening in each of these photos?
This diagram shows what happens to light which is reflected by the pencil.
The light bends when it leaves the water.
Your brain thinks that light always travels in straight lines so the pencil tip seems to be nearer the surface than it really is.
Refraction
Can you now explain what is happening in each of these photos?
Refraction
Can you help Mr Trent catch the fish?
1 The disappearing coin trick works by refraction.
a) Copy the two lower diagrams and complete the second one.
b) Explain how the trick works.
Refraction
Can you hide the coin?
b) Explain how the trick works.
The water refracts the light rays coming from the coin.
Refraction
1. The disappearing coin trick works by refraction.
When a pencil is put into a beaker of water it looks bent. This is because the light is refracted as it leaves the water. The light travels faster in air than water
slower reflected bent faster refracted
Choose three of these words to complete the sentences
Refraction
What happens to the pencil?
Plenary
1.
2..
3.
Quiz!
Refraction
Quiz – Write your answers in your book
Plenary
A hits an opaque object.
B bounces off a mirror.
C is scattered by a rough surface.
D bends as it goes from one substance into another.
Refraction
Quiz – Write your answers in your book
Plenary
A light speeds up when it meets a denser transparent material.
B light slows down when it meets a denser transparent material.
C light stops when it meets a denser transparent material.
D light reflects inside denser transparent materials.
Refraction
Quiz – Write your answers in your book
Plenary
3 Which diagram shows the correct rays?
A
B
C
D
Refraction
Quiz – Write your answers in your book
Plenary
A in the centre of a transparent substance
B all the way through a transparent substance
C as light travels from one opaque substance into another
D as light travels from one transparent substance into another
Refraction
Quiz – Write your answers in your book
Plenary
A hits an opaque object.
B bounces off a mirror.
C is scattered by a rough surface.
D bends as it goes from one substance into another.
Refraction
Swap books – check your answers
Plenary
A light speeds up when it meets a denser transparent material.
B light slows down when it meets a denser transparent material.
C light stops when it meets a denser transparent material.
D light reflects inside denser transparent materials.
Refraction
Swap books – check your answers
Plenary
A
B
C
D
Refraction
Swap books – check your answers
Plenary
A in the centre of a transparent substance
B all the way through a transparent substance
C as light travels from one opaque substance into another
D as light travels from one transparent substance into another
Refraction
Swap books – check your answers
Plenary
Refraction
Are you now able to…
Learning Objectives
I still feel unsure. I need some more help to understand.
I feel ok. I need to do some more work to check my understanding.
I am happy and feel I understand and can explain the main points.
:
(
:
)
:
|
(L3) Can state what happens to light as it hits glass at an angle.
(L4) Can describe how light bends towards or away from the normal when it changes medium.
(L5) Explain why refraction happens.
This is because glass is more dense than the air and it slows down the light.
The light ray bends away from the normal again when it travels into air which is less dense.
The light ray bends towards the normal when it enters the glass from the air.
Dispersion
Why was the light refracted?
Do Now
Dispersion
Explain how the trick works
Starter
The water refracts the light rays coming from the coin.
Dispersion
What would life be like without colour?
Task 1
Dispersion
Dull.
Dispersion
Challenge: Can you make a rainbow using glass prism and white light?
Task 1
Dispersion
Breaking up white light
You’ve just seen how a prism can break up white light into 7 colours.
This breaking up of white light is called dispersion. The prism disperses the light.
Dispersion
This breaking up of white light is called dispersion. The prism disperses the light.
RED
ORANGE
YELLOW
GREEN
BLUE
INDIGO
VIOLET
top
bottom
When white light is broken up like this the 7 colours are always in the same order.
Dispersion
Can you remember all 7?
ROY GBIV
The shape of the prism means they spread out even more on leaving the prism.
You may see a small spectrum with a rectangular glass block but the colours do not spread out as much.
Dispersion
What is the spectrum?
(L3) Recall that white light can be split to make a spectrum.
(L4/5) Describe and attempt to explain some effects of dispersion.
(L5) Explain why we classify some
colours as primary and secondary colours.
Why does light disperse like this?
The size of a wave is measured from one peak to the next and is called its wavelength.
(L3) Recall that white light can be split to make a spectrum.
(L4/5) Describe and attempt to explain some effects of dispersion.
(L5) Explain why we classify some
colours as primary and secondary colours.
White light is made up of all the colours of the rainbow.
Each colour has its own wavelength.
Red has the longest and violet has the shortest wavelength.
(L3) Recall that white light can be split to make a spectrum.
(L4/5) Describe and attempt to explain some effects of dispersion.
(L5) Explain why we classify some
colours as primary and secondary colours.
But the shorter wavelengths slow down most and so bend more sharply.
When light enters a glass prism it slows down.
Blue is a short wavelength.
Red is the longest one.
(L3) Recall that white light can be split to make a spectrum.
(L4/5) Describe and attempt to explain some effects of dispersion.
(L5) Explain why we classify some
colours as primary and secondary colours.
As each wavelength, or colour, slows down at a different rate it therefore has a different angle of refraction to the rest.
This means the
different colours
spread out.
Blue Bends Best
When a second prism is added ‘upside down’ the dispersion of the second prism is in the opposite direction to the original dispersion.
White light is formed again.
Dispersion
Can you recombine colours?
Dispersion
Can you remember all 7?
ROY GBIV
Write 1-7 in your books
Write down the colour light (s) that will pass through the filter.
Dispersion
Dispersion
Dispersion
Light vs Art
Colours are made by mixing other colours of light.
There are three primary colours of light used to make all other colours. What are these colours?
red
green
blue
The three primary colours of light are red, green and blue.
magenta
The colours made by mixing two primary colours are called
the secondary colours – magenta, yellow and cyan.
Dispersion
Can you remember all 7?
A red filter absorbs all colours…
A blue filter absorbs all colours…
A green filter absorbs all colours...
…apart from red light.
…apart from blue light.
…apart from green light.
A magenta filter absorbs all colours…
A cyan filter absorbs all colours…
A yellow filter absorbs all colours...
…apart from red and blue.
…apart from green and blue.
…apart from red and green.
A magenta filter absorbs all colours…
A cyan filter absorbs all colours…
A yellow filter absorbs all colours...
…apart from red and blue.
…apart from green and blue.
…apart from red and green.
Filters let certain colours of light pass through, but absorb all other colours.
object
filter
1
Filters let certain colours of light pass through, but absorb all other colours.
object
filter
2
Filters let certain colours of light pass through, but absorb all other colours.
object
filter
3
Filters let certain colours of light pass through, but absorb all other colours.
object
filter
4
Filters let certain colours of light pass through, but absorb all other colours.
object
filter
4
Filters let certain colours of light pass through, but absorb all other colours.
object
filter
5
Filters let certain colours of light pass through, but absorb all other colours.
object
filter
6
Filters let certain colours of light pass through, but absorb all other colours.
object
filter
7
Dispersion
Learning Objectives
(L3) Recall that white light can be split to make a spectrum.
(L4/5) Describe and attempt to explain some effects of dispersion.
(L5) Explain why we classify some
colours as primary and secondary colours.
I still feel unsure. I need some more help to understand.
I feel ok. I need to do some more work to check my understanding.
I am happy and feel I understand and can explain the main points.
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Electromagnetic Spectrum
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