Waves & Sound

The highest point on a wave

• wavelength

• crest

• trough

• amplitude

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The lowest point on a wave

• crest

• frequency

• wavelength

• trough

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The horizontal distance between crests

• amplitude

• frequency

• crest

• wavelength

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The distance from the resting position to the crest of a wave.

• amplitude

• wavelength

• frequency

• pitch

Tags

NGSS.4-PS4-1

What might happen to an object sitting on top of a speaker if loud music is played through the speaker?

• Absolutely nothing would happen to the object.

• The object could move due to the vibrations of the sound.

• The object could appear a different color because the sound is absorbed.

• The object could stop the sound from being transmitted out of the speaker because sound cannot travel through a solid.

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How does sound travel?

• in waves

• only through the air

• through magnets

• as thermal energy

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Which TWO of the following statements about sound are NOT true?

• Sound is produced through vibrations.

• Sound travels in waves.

• Sound can travel through outer space

• Sound waves can bounce off of objects to create an echo.

• Sound waves can only travel through the air.

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NGSS.4-PS4-1

Sound waves can travel through all three states of matter. Which of the following best explains why sound travels most quickly through a solid?

• Solids always produce an echo, which makes the sound seem louder to the human ear.

• Only solids allow the vibrations to travel from one atom (particle) to another.

• In solids, the atoms (particles) are closest together, which allows the vibrations to travel rapidly from one to another through the object.

• Sound does not travel quickly through a solid. It travels most rapidly through a gas.

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Why can't sound travel through outer space?

• There is almost no matter in outer space, so the vibrations have no way to travel through the atmosphere. There is nothing to carry the sound waves through space.

• Sound actually travels very quickly through outer space because there is no matter to slow down the sound waves.

• There are too many planets and stars in outer space that absorb all of the sound waves, so they cannot travel to the human ear.

• Because outer space is a "vacuum," the vibrations are irregular and travel in too many directions for us to detect the sound.

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If you pluck a guitar string, it vibrates and creates a sound. In order to stop the sound, you could...

• blow on the string.

• pluck a different string.

• place your hand on the string to stop the vibration.

• pluck the same string again.

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