Lianabel0517
19.04.2020 •
Physics
A plane flies at 200 m/s, emitting a 600 Hz roar. Assuming a 340 m/s speed of sound, what will be the frequency of sound waves heard by a stationary observer directly behind the plane? I NEED THIS ASAP PLEASE
A. 247 Hz
B. 260 Hz
C. 378 Hz
D. 400 Hz
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Ответ:
378 Hz
Explanation:
When source of sound moves away from stationary listener
f' = f x V / ( V + Vs)
f' = 600 x 340 / ( 340 + 200)
f' = 204000/540
f' = 378 Hz
Ответ:
14 15 16
Explanation:
14+15+16=45