A train is moving on a straight track with speed … It is blowing its whistle at the frequency of … …. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound …) close to :

Waves

JEE Main 2015 · Session, Shift 1 · Q8517

PhysicsMedium85×since 2002Q8517

A train is moving on a straight track with speed

20\,m{s^{ - 1}}.

It is blowing its whistle at the frequency of

1000

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\,m{s^{ - 1}}

) close to :