The Nature of Sound

Sound

• A source of energy that causes a medium to vibrate

• A disturbance that travels through a medium as a longitudinal wave

• A disturbance that travels through a medium as a surface wave

• A disturbance that depends on the frequency of the pitch

• A disturbance that causes energy to move from place to place

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Elasticity

• Sound waves with frequency above normal human range

• The quality of the sound you hear

• The ability of a material to bounce back after being disturbed

• A small, stretchable, drum-like membrane

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The speed of sound depends on the _____ of the medium.

• Elasticity

• Density

• Temperature

• Frequency

• Speed

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When sound hits a barrier with a small hole in it, it bounces back.

• True

• False

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Density

• How much matter or mass there is in a given in a space or volume

• How slow a given object is

• The most amount of matter

• The amount of elasticity in an object

Sound travels faster at higher temperatures

• True

• False

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Larynx

• Your voicebox

• Your trachea

• Your lungs

• A medium in which sound can travel faster

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Sound begins with Vibration

• True

• False

• Sometimes True

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A character in an old western movie puts his ear on a railroad track to test if a train is coming. Why is this

• The molecules are compressing and rarefying on the steel tracks, making it harder to hear.

• The sound travels easily through the steel tracks

• The thermal energy of the tracks increase, therefore allowing the train to be heard

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The hotter a medium is, the _____ the sound waves would be. The colder an object is, the _____ the sound waves would be

• Faster, Slower

• Slower, Faster

• Higher Pitch, Lower Pitch

• Lower Pitch, Higher Pitch

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