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physics > Module 3 Part 3: Sound Waves > Flashcards

Module 3 Part 3: Sound Waves Flashcards

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1
Q

what type of wave is sound

A

its is a mechanical and longitudinal wave

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2
Q

what frequencies are humans able to hear

A

20-20000 Hz

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3
Q

what are the types of sound (3)

A

Infra-sound
Audible sound
Ultra-sound

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4
Q

what is the range of infra-sound

A

less than 20 Hz

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5
Q

what is the range of audible sound

A

between 20-20 000 Hz

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6
Q

what is the range of ultra-sound

A

More than 20 000 Hz

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7
Q

what changes the speed of a wave

A

the medium it moves through

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8
Q

what is the approx speed of sound through air

A

340 m/s

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9
Q

what is the approx speed of sound through water

A

1500 m/s

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10
Q

what is the approx speed of sound through metal

A

3000 m/s

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11
Q

how is pitch determined

A

by the frequency of the sound wave

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12
Q

how is volume determined

A

by the amplitude of the sound wave

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13
Q

what is the symbol for sound intensity

A

I

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14
Q

relationship of sound intensity vs distance

A

I α 1/d²

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15
Q

what are beats

A

when two sounds of similar amplitude but slightly different frequency interact and create a regular pulse like sound

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16
Q

formula for frequency of beats

A

fᵦₑₐₜ = |f₁-f₂|

17
Q

what is the Doppler effect

A

the apparent change in the frequency of a wave due to the relative motion of the source and observer

18
Q

what is the equation for the Doppler effect

A

f’ = f (Vᵥᵥₐᵥₑ + Vₒᵦₛₑᵣᵥₑᵣ)/ (Vᵥᵥₐᵥₑ - Vₛₒᵤᵣ𝒸ₑ)

19
Q

what is f’ in the Doppler effect equation

A

the observed frequency

20
Q

what is f in the Doppler effect equation

A

the original frequency

21
Q

what is Vᵥᵥₐᵥₑ in the Doppler effect equation

A

the speed of the waves

22
Q

what is Vₒᵦₛₑᵣᵥₑᵣ in the Doppler effect equation

A

the speed of the observer

23
Q

what is Vₛₒᵤᵣ𝒸ₑ in the Doppler effect equation

A

the speed of the source

24
Q

what is V measured in

A

m/s

physics (10 decks)

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