6.P.1.3 Sound Waves

Sound is produced by

• electrical signals in the brain

• the presence of a vacuum

• radiation from electromagnetic waves

• the vibration of a medium

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The sound of your voice is caused by

• the movement of your lips

• your vocal cords vibrating

• an electromagnetic wave

• the bones of your ear

What kind of wave is sound?

• longitudinal

• radio

• transverse

• electromagnetic

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In which of the following materials would sound waves move fastest?

• water

• hot air

• steel

• cool air

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A rapid, back-and-forth motion is a

• vibration

• seesaw

• pupil

• cochlea

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Compare how sound waves and light waves travel.

• Sound waves and light waves travel at the same speed.

• Sound waves and light waves do not travel.

• Sound waves travel faster than light waves.

• Light waves travel faster than sound waves.

What part of the ear has the anvil, the stirrup and the hammer?

• outer ear

• inner ear

• middle ear

• ear canal

If you are attending a rock concert and the sound of the guitar is much louder than the singer’s voice, which of the following conclusions would be the most reasonable?

• The guitar is producing higher frequency sound waves than the singer’s voice.

• The singer is producing higher frequency sound waves than the guitar.

• The guitar is producing sound waves of a higher amplitude than the singer’s voice.

• The singer is producing sound waves of a higher amplitude than the guitar’s strumming.

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Elena plucked a tight string softly, then harder. What happened when Elena plucked the string

harder?

• The pitch got lower.

• The pitch got higher.

• The sound was louder.

• The sound was quieter.

Jorge wants to make the pitch of a sound wave lower. He should

• decrease its wavelength

• decrease its frequency

• decrease its amplitude

• decrease its speed