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Frequency of sound detected by sub b

Assignment:

Two submarines are underwater and approaching each other head-on. Sub A has a speed of 13 m/s and sub B has a speed of 7 m/s. Sub A sends out a 1150 Hz sonar wave that travels at a speed of 1522 m/s.

(a) What is the frequency of the sound detected by sub B?
______Hz

(b) Part of the sonar wave is reflected from B and returns to A. What frequency does A detect for this reflected wave?
_____Hz

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