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Author Question: A microphone in the ocean is sensitive to the sounds emitted by porpoises. To produce a usable ... (Read 94 times)

EY67

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Question 1

A bat, flying at 5.00 m/s, emits a chirp at 40.0 kHz. If this sound pulse is reflected by a wall, what is the frequency of the echo received by the bat? (vsound = 340 m/s.)


Question 2

A microphone in the ocean is sensitive to the sounds emitted by porpoises. To produce a usable signal, sound waves striking the microphone must have an intensity of 1.02 × 1011 W/m2. If porpoises emit sounds with a power of 0.049 9 W, how far away can a porpoise be and still be heard? Disregard absorption of sound waves by the water.


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Marked as best answer by EY67 on Aug 6, 2020

angrybirds13579

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EY67

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Reply 2 on: Aug 6, 2020
Wow, this really help


meow1234

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

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