3.5.2 Speed of waves BEST

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Diagnostic questions

Slow motion

The wave moves from 5cm to 25cm in 0.2 seconds. What is the speed of the wave?

1 分

A 4cm/s

B 5cm/s

C 20cm/s

D 100cm/s

E 125cm/s

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Faster spring waves

1) a) Which wave moves faster along the slinky?

1 分

A Wave X moves faster.

B Wave Y moves faster.

C Both waves move at the same speed.

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1) b) What is the best reason for your last answer?

1 分

A Both waves move along the same slinky.

B It has more energy.

C It has more force.

D Less slinky needs to be moved.

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2) a) Which wave moves faster along the slinky?

1 分

A Wave X moves faster.

B Wave Y moves faster.

C Both waves move at the same speed.

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2) b) What is the best reason for your last answer?

1 分

A Both waves move along the same slinky.

B It has more energy.

C It has more force.

D Less slinky needs to be moved.

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Spring waves

a) The wave pulse reaches the second spring. What is the most likely thing that will happen to its speed as it enters the second spring?

1 分

A It will continue to move at the same speed.

B It will move at a different speed.

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b) The statements describe changes to the wave pulse as it enters the second spring. They are all correct. Which statement is the best reason for your answer to part a)?

1 分

A The wave pulse is moving along a different spring.

B The frequency of the wave pulse does not change.

C The amplitude of the wave pulse changes.

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Two shakes

Which of these two waves has the highest frequency?

1 分

A They both have the same frequency.

B Wave X has the highest frequency.

C Wave Y has the highest frequency.

D It is impossible to tell from the information given.

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A wave equation

a) The frequency is changed from three to two waves per second (2Hz). At a frequency of 2Hz, what is the wavelength (λ) of each wave?

1 分

A Wavelength, λ = 1.20m

B Wavelength, λ = 1.80m

C Wavelength, λ = 2.40m

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b) Which of these ideas did you use to work out your last answer? The wave medium is what the wave moves through. Here it is the water.

1 分

A The wave’s shape depends only on the wave medium.

B The wave’s speed depends only on the wave medium.

C The wave’s speed is changed by the frequency of the wave.

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Changing waves

1) What will happen if the frequency of the wave is doubled?

1 分

A Wavelength will double.

B Speed will double.

C Wavelength will halve.

D Speed will halve.

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2) What will happen if the wavelength of the wave is tripled?

1 分

A Frequency will triple.

B Speed will triple.

C Frequency will become three times smaller.

D Speed will become three times smaller.

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3) What will happen if the frequency of the wave is halved?

1 分

A Wavelength will double.

B Speed will double.

C Wavelength will halve.

D Speed will halve.

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4) What would cause the speed of the wave to double?

1 分

A Doubling the frequency.

B Doubling the wavelength.

C Changing the rope.

D Any one of the above.

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Slow wave

The wave moves at a slower speed along the second spring. What happens to the properties of the wave when it slows down? What do you think about each statement?

3 分

I am sure this is right

I think this is right

I think this is wrong

I am sure this is wrong

A Its wavelength stays the same.

B Its frequency stays the same.

C Its frequency = speed of the wave, divided by the number of waves passing a point in one second.

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