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Question: bats use high pitch sounds or calls for navigation and...

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Bats use high pitch sounds or “calls” for navigation and locating its prey. Assume that a flying bat emits a call at a frequency 82.5 kHz and receives an echo from an object at rest. The frequency received by the object is 79.7 kHz.

(a) Is the bat flying towards or away from the object?

(b) What is the speed of the bat towards/away from the object?

(c) The bat call has a sound wave intensity of 3 ×10-8 W/m2 . What is this value in decibels?

(d) What frequency does the bat hear due to the echo?

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