Wave Mechanics Question 687
Question: A train has just completed a U-curve in a track which is a semicircle. The engine at the forward end of the semicircular part of the track while the last carriage is at the rear end of the semicircular track. The driver blows a whistle of frequency 200 Hz. Velocity of sound is 340 m/s. Then the apparent frequency as observed by a passenger in the middle of a train when the speed of the train is 30 m/s is
Options:
A) 209 Hz
B) 288 Hz
C) 200 Hz
D) 181 Hz
Show Answer
Answer:
Correct Answer: C
Solution:
[c] The line of motion of engine is perpendicular to line of motion of the observer at that instant, so $ f’=f=200,Hz $
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