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BMAT Physics > SOUND > Flashcards

SOUND Flashcards

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1
Q

what type of wave is sound

A

longitudinal, mechanical

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2
Q

what can sound travel through

A

any medium except vacuum

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3
Q

what is compression

A

region of increased pressure on sound wave

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4
Q

what is rarefraction

A

region of decreased pressure on sound wave

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5
Q

what can sound not travel through

A

vacuum

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6
Q

what can increase the velocity of sound

A

temperature

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7
Q

what is the velocity of sounds fastest in travelling through

A

solids

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8
Q

what is sound intensity

A

rate of energy through movement through space

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9
Q

how do you calculate sound intensity

A

I = A2 X F2

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10
Q

what measures sound levels

A

decibel (dB)

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11
Q

what is the sound intensity equation

A

IL = 10 log10 (I / Io)

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12
Q

what is the sound intensity equation using logs

A

IL = 10 log10 I / I0

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13
Q

what happens when two sound waves of different frequency are heard together

A

alternating constructive and destructive interference

causes the sound to be alternatively soft and loud.

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14
Q

alternating destructive and destructive interference fo alternating frequency soundwaves is termed what

A

producing beats

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15
Q

how is beat frequency calculated

A

beat frequency is equal to the absolute value of the difference in frequency of the two waves that produce the beats

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16
Q

if two sound waves with frequencies of 262 Hz and 252 Hz are played simultaneously - what would the beat frequency be

A

a beat frequency of 10 Hz will be detected

17
Q

what is the doppler effect

A

a shift in the frequency of sounds received by the observer due to relative motion of source and observer

18
Q

what creates change in frequency

A

relative motion between observer and source

19
Q

what happens if distance between source and observer is increased

A

shift to shorter wavelengths and higher frequencies

20
Q

what happens if distance between source and observer is decreased

A

shift to longer wavelengths and lower frequencies

BMAT Physics (12 decks)

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