P3.4 - Sound Flashcards

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1
Q

What is sound wave? [1]

A

A longitudinal wave that transfers energy through vibration of particles.

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2
Q

What can sound waves be described by? [3]

A
  • frequency
  • wavelength
  • amplitude
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3
Q

What does a high amplitude lead to, in terms of sound? [1]

A

Louder sound

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4
Q

What does a high frequency lead to, in terms of sound? [1]

A

Higher pitched sound

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5
Q

What does sound travel at, in air? [1]

A

330m/s

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6
Q

What does speed =? [1]

A

distance/time

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7
Q

How do you find the distance from the source to the reflector in metres? [2]

A

330 x the time taken (number of seconds)

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8
Q

What type of medium does sound travel the fastest in? [1]

A

Solids

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9
Q

What type of medium does sound travel the slowest in? [1]

A

Gases

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10
Q

When does sound travel faster? [1]

A

The denser the material

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11
Q

Does light travel faster or slower in denser materials? [1]

A

Slower

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12
Q

Why does sound travel faster in denser material? [3]

A
  1. particles are closer together
  2. particles can collide with the next particle quicker
  3. particles can more efficiently transfer the energy
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13
Q

What is the range of frequencies audible to humans? [2]

A

20Hz to 20kHz

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14
Q

What is ultrasound? [1]

A

Sound with a frequency
higher than 20kHz

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15
Q

What is an echo? [1]

A

The reflection of a sound wave

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16
Q

What are sound waves caused by? [1]

A

Vibrations

17
Q

What temperature of air does sound travel the fastest at? [1]

A

Hot air

18
Q

What is the equation for the speed of sound? [2]

A

speed of sound = distance travelled/time taken

19
Q

If the frequency is higher, what happens to the wavelength? [1]

A

Wavelength is shorter

20
Q

Why can sound not exist in a vacuum? [1]

A

As there are no particles to vibrate.

21
Q

What are compressions? [2]

A

regions of higher pressure due to particles being closer together

22
Q

What are rarefractions? [2]

A

regions of lower pressure due to particles being further apart