# A train is moving on a straight track with speed

Question:

A train is moving on a straight track with speed $20 \mathrm{~ms}^{-1}$. It is blowing its whistle at the frequency of $1000 \mathrm{~Hz}$. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound $=320 \mathrm{~ms}^{-1}$ ) close to :-

1. $18 \%$

2. $24 \%$

3. $6 \%$

4. $12 \%$

Correct Option: , 4

Solution:

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