A person standing a certain distance from an airplane with four equally noisy je
ID: 1424817 • Letter: A
Question
A person standing a certain distance from an airplane with four equally noisy jet engines is experiencing a sound level of 137 dB . What sound level would this person experience if the captain shut down all but one engine? [Hint: Add intensities, not dB's.] A person standing a certain distance from an airplane with four equally noisy jet engines is experiencing a sound level of 137 dB . What sound level would this person experience if the captain shut down all but one engine? [Hint: Add intensities, not dB's.]Explanation / Answer
dB = 10*log base 10 (power) so
10 log( power / 4) = 10 log(power) - 10 log(4)
we already have 10 log(power) = 137 so we figure out that 10 log(4) = 6.02 So the dB power of 1 engine would be 137 - 6 = 131 dB
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