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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NGSS.MS-PS4-1

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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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NGSS.MS-PS4-1

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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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NGSS.MS-PS4-2

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.

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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NGSS.MS-PS4-1

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.

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NGSS.MS-PS4-1

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

Mohammed turns up the volume on his TV. The TV sends an electrical signal to the speakers. The signal changes the sound’s

• frequency

• speed

• amplitude

• pitch

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