A train is approaching a station with a uniform velocity of 72 kmph and the frequency of the whistle of that train is 480 Hz. The apparent increase in the frequency of that whistle heard by a stationary observer on the platform is (Velocity of sound in air is 340 m/s).

A train is approaching a station with a uniform velocity of 72 kmph an

1.	A train is approaching a station with a uniform velocity of 72 kmph and the frequency of the whistle of that train is 480 Hz. The apparent increase in the frequency of that whistle heard by a stationary observer on the platform is (Velocity of sound in air is 340 m/s).
A.	45 Hz
B.	15 Hz
C.	60 Hz
D.	30 Hz
Answer» E.