Question

A train has just completed a $U$-curve in a track which is semicircle. The engine is at the forward end of the semicircular part of the track while the last carriage is at the rear end of the semicircular track. The driver blows a whistle of frequency $200Hz$. Velocity of Sound is $340m{s}^{-1}$. Then, the apparent frequency as observed by a passenger in the middle of a train is $30m{s}^{-1}$ :

• A. $209Hz$
• B. $288Hz$
• C. $200Hz$
• D. $181Hz$

Answer 1

The correct option is C $200Hz$

Whistling engine and the motion of passenger at the middle of the train are perpendicular.
hance no change in frequency will be observed.
Option"C" is correct.