SCIENCE: Understanding Sound

THIS IS A QUIZ - IT IS NOT A TEST

It is to help you find correct answers - not to mark you down for incorrect answers!

Please think before answering each question, then skip any you don't understand.

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When you have completed the quiz, please return to the wiki at:

http://wps.flipster.org/doku.php?id=flipsters:sound:home

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Have fun :)

Questions adapted from:
* contrasting student and scientific views - http://www.education.vic.gov.au
* http://baldufa.upc.edu/recerca/articles/a42/eaeeie_2009_misconceptions_sound_waves.pdf

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    1. SOUND PROPAGATES (TRAVELS) IN A LONGITUDINAL WAVE:

    Sound propagates (travels) in a longitudinal wave
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    2. SOUND OF A SOFT HIT COMPARED WITH A HARD HIT:

    Sound of a soft hit compared with a hard hit
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    WHEN SOUND HITS A SOLID BRICK WALL:

    When sound waves hit a solid brick wall
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    3. SOUND CREATED BY TWO SOLID OBJECTS:

    Sound created by two solid objects

    Q3.0

    When one solid object is struck firmly by another solid object, or when one vibrating object is placed onto, or connected to, that solid object:
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    4. SOUND OF A WATCH TRAVELLING THROUGH A RULER:

    Sound of a watch travelling through a ruler

    Q4.0

    If you place a solid wooden ruler (or similar) so it touches both a ticking watch (or any other device that makes a 'quiet' noise) and your ear, the sound becomes much louder.
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    SOUND TRAVELLING FROM A DISTANCE:

    Sound at a distance
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    6. SOUND TRANSMISSION THROUGH A WALL:

    Sound transmission through a wall

    Q6.0

    A room was divided in half by a new, solid brick wall. The floor and ceiling were made of thick concrete.There were no doors, windows or gaps in the new wall. When standing close to the wall in one room, it was possible to hear some of the sounds coming from the other side of the wall (although the sounds coming through were only weak and not very clear).
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    Q7.0

    A guitar string is plucked and made to vibrate. As a result, the guitar makes a sound. Which of the following theories best describes the way that the string generates sound? A) - When the string vibrates, it emits sound particles (similar to the particles or molecules in the air) that move in all directions. These travelling sound particles make the sound that travels through the air. B) - When the string vibrates, it also causes the vibration of some of the sound particles This vibration of sound particles is passed on to neighbouring sound particles, and this creates a wave that travels through the air. C) - When the string vibrates, it vibrates air particles that come into contact with it. The air particles collide with neighbouring ones, and this is repeated in all directions, creating a travelling sound wave. D) - When the string vibrates, it moves the air particles that come into contact with it. These air particles travel out in all directions and carry the sound with them.
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    8. SOUND SENT OUT FROM A LOUDSPEAKER:

    Sound sent out from a loudspeaker

    Q8.0

    Which of the following theories best describes the way that sound is sent out from a loudspeaker to effect a human eardrum? A) - Air particles, vibrate when they come into contact with the loudspeaker. When they come into contact with neighbouring air particles, they make them vibrate also. This makes the sound move out from the loudspeaker. B) - Air particles, vibrate when they come into contact with the loudspeaker. These air particles move out carrying the sound from the loudspeaker to the ear. C) - The sound particles emitted by the loudspeaker move out through the air, causing the air particles to vibrate and to pass on the sound. D) - The sound particles from the loudspeaker pass through the air and carry sound from the loudspeaker to the ear.
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    9. WHAT MAKES THINGS SOUND DIFFERENT:

    What makes things sound different

    Q9.0

    Why do musical instruments make different sounds (example: why does a guitar sound different to a drum or a flute)? A) - The sound/pitch of musical instruments only depends on their shape and whether they are played hard or softly. B) - A musical sound/pitch is a blend of many different frequencies. The sound/pitch depends on the total combination of all of these frequencies which are different for each instrument. C) - The sound mostly depends on the size of the instrument and whether it is played using air (flute), strings (guitar) or percussion (drums) D) - The sounds are built into the instrument when it is made in the factory.
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    WHAT IS THE DIFFERENCE BETWEEN SOUND & NOISE:

    What is the difference between sound and noise
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