Question 16 of 17 ncorrect Map sapling learning In each of the four scenarios to

Question

Question 16 of 17 ncorrect Map sapling learning In each of the four scenarios to the right, a large bat lets out a short burst of ultrasonic sound, which the smaller bat hears a moment later. If the large bat flies at 14.00 m/s and the small bat flies at 3.530 m/s, rank the frequency that the smaller bat detects in the four scenarios, from highest to lowest. Assume that the speed of sound is 343.0 m/s. highest frequency lowest frequency In scenario C, some of the large bat's signal reflects off of the small C bat and returns to the large bat, warning it of the smaller bats presence. If the initial signal has a frequency of 24.30 kHz, what return frequency will the large bat detect? Calculate the final frequency to four significant figures. There is a hint available! View the hint by clicking on the bottom divider bar. Click on the divider bar again to hide the hint. kHz Close A Previous Give Up & View Solution Check Answer Next Exit Hint

Explanation / Answer

f = Fo•(V + Vr)/(V + Vs) Doppler
Vr +ve if rcvr moving toward srce; Vs -ve if srce moving toward rcvr

A: f = Fo*(343.0 - 3.53) / (343.0 - 14) = 1.03182 * Fo
B: f = Fo*(343.0 - 3.53) / (343.0 + 14) = 0.9509 * Fo
C: f = Fo*(343.0 + 3.53) / (343.0 - 14) = 1.0533* Fo
D: f = Fo*(343.0 + 3.53) / (343.0 + 14) = 0.9707 * Fo

I get C-A-D-B.

Then
f = 24.30kHz * (343.0 + 3.53)*(343.0 + 14) / [(343.0 - 3.53)*(343.0 - 14)]
f = 24.30kHz * 123,711.21/ 111,685.63 = 26.9165 kHz

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