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:

Leave a comment

None
Free Study Material