Quick practice
Question 1 of 5
An engine is moving on a circular track with a constant speed. It is blowing a whistle of frequency 500 Hz. The frequency received by an observer standing stationary at the centre of the track is
A
Less than 500 Hz
B
500 Hz
C
More than 500 Hz
D
More or less than 500 Hz depending on the actual speed of the engine
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