A bat is flitting about in a cave, navigating via ultrasonic bleeps. Assume that the sound emission frequency of the bat is 37.5 kHz. During one fast swoop directly toward a flat wall surface, the bat is moving at 0.021 times the speed of sound in air. What frequency does the bat hear reflected off the wall?

39.11 Hz

Explanation:

Data provided in the question:

Frequency of sound emission, = 37.5 kHz = 37500 Hz

Speed of bat, = 0.021 times the speed of sound

Now,

Frequency heard by bat =

Therefore,

The Frequency heard by bat will be =

or

Frequency heard by bat will be=

or

Frequency heard by bat will be = 39108.78 Hz = 39.11 Hz

small = small current large mag large current

unbalanced force

explanation: