AIPMT MAINS2012Physics-Waves
AIPMT MAINS 2012 Physics Doppler Effect MCQ Question
Type: MCQ-conceptual-Medium-Class 11
A train moving at a speed of 220 ms⁻¹ towards a stationary object, emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the train is: (speed of sound in air is 330 ms⁻¹)
A
3500 Hz
B
4000 Hz
C
5000 Hz
D
3000 Hz
Correct Answer
Option C
Detailed Explanation
The frequency of the echo detected by the driver of the train is calculated using the formula f' = ((v + u) / (v - u)) * f. Substituting the given values, f' = ((330 + 220) / (330 - 220)) * 1000 = 5000 Hz.
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