Sound Waves Flashcards

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1
Q

How are sound waves caused?

A

By vibrating objects.
These mechanical vibrations are passed through the surrounding medium as a series of compressions.
Type of longitudinal wave.

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2
Q

Where does sound travel to?

A

Someone’s ear drum and at which point a person may hear it.

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3
Q

Where does sound travel faster?

A

In solids than in liquids.

Faster in liquids than in gases.

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4
Q

Where can’t sound travel in?

A

Space as its mostly vacuum.

No particles.

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5
Q

Sound waves will be reflected by hard flat surfaces.

A

This is very noticeable in an empty room.
A big empty room sounds completely different once you’ve put carpet/funiture in.
Things absorb the sound quickly and stop it echoing around the room.
You hear a delay between the original sound and the echo because the echoed sound waves have to travel further and so take longer to reach ears.

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6
Q

Sound waves also refract when they enter different media.

A

Denser material they speed up.
However, since sound waves are always spreading out so much the change in direction is hard to spot under normal circumstances.

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7
Q

Higher frequency sound waves=

A

high pitched like a squeaking mouse.

Shorter wavelength.

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8
Q

Low frequency sound waves=

A

low pitched like a mooing cow.

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9
Q

Frequency of 100 Hz vibrates =

A

100 times each second.

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10
Q

Loudness=

A

amplitude.

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11
Q

Bigger the amplitude =

A

louder the sound.

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