A meteor is falling from space at 1500 m/s coming directly at you. Because of it

Question

A meteor is falling from space at 1500 m/s coming directly at you. Because of it's irregular surface it's making a whistling sound as it falls through earth atmosphere. At a moment when it is 2.1 km over your head the frequency of 3.3 kHz and loudness of 20dB. At the meteor what is the frequency and power of this sound? A meteor is falling from space at 1500 m/s coming directly at you. Because of it's irregular surface it's making a whistling sound as it falls through earth atmosphere. At a moment when it is 2.1 km over your head the frequency of 3.3 kHz and loudness of 20dB. At the meteor what is the frequency and power of this sound?

Explanation / Answer

Part A)

From the Doppler Effect...

f = f'(v)/(v-vs)

f = 3300(343/343-1500)

f = 978 Hz

Part B)

Apply B = 10log(I/Io)

20 = 10log(I/1 X 10-12)

I = 1 X 10-10 W

P = IA

P = (1 X 10-10)(4pi)(2100)2

P = 5.54 X 10-3 W

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