JEE · NEET Previous Year Question
A person feels 2.5% difference of frequency of a motor-car horn. If the motor-car is moving to the person and the velocity of sound is 320 m/sec, then the velocity of car will be
Topic: NEET PYQ
Answer: A. Full step-by-step solution below.
- A8 m/s (approx.)
- B800 m/s
- C7 m/s
- D6 m/s (approx.)
Correct answer: A
Solution
(a) By Doppler’s formulaSince, source is moving towards the listener so .
If n = 100 then n' = 102.5
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