Show all work! Thank you! 11.3) A jet plane emits P Joules of sound energy per...
Show all work! Thank you!
11.3)
A jet plane emits P Joules of sound energy per second.
a. Neglecting any absorption of sound energy by the air, what is the sound level β a distance r meters away? Express your answer using the symbols P, r, and I0, where I0 represents is the constant given by I0 = 10-12. (answer in dB)
HINT: How does sound intensity depend on distance from the source? 10 log( P/(I0 * 4*pi*r2) is not the answer
b. Evaluate your above answer numerically using the values P = 4.8 × 105 J/s and r = 30 m. (answer in dB)
HINT: How does sound intensity depend on distance from the source?
c. Air absorbs sound at a rate of about 7.0 dB/km. Taking into account air absorption, calculate what the sound level will be 0.9 km away. (answer in dB)
d. Taking into account air absorption, calculate what the sound level will be 4.5 km away. (answer in dB)
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11.3)
A jet plane emits P Joules of sound energy per...
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