Question

A passenger is sitting in a fast moving train. The engine of the train blows a whistle of frequency N. If the apparent frequency of sound heard by the passengers is \( N' \), then:

• A. \( N' = N \)
• B. \( N' < N \)
• C. \( N' > N \)
• D. \( N' N = 1 \)

Hint:

In the case of a passenger sitting in a moving train, the apparent frequency heard is unaffected by the motion of the train.

Answer 1

The Correct Option is A

The apparent frequency of sound heard by the passengers depends on the relative motion between the source and the observer. Since the passenger is moving with the train, the frequency heard by them is the same as the frequency emitted by the whistle, \( N' = N \).