MHT CET Physics question
A person is standing on a railway platform. An engine blowing a whistle of frequency 640 Hz approaches him with a speed of 72 km/hr. The frequency of the note heard by the person is (velocity of sound is 340 m/s)
Answer: (D)
Solution
m/s, so Hz; 650, 660 and 675 Hz are not obtained. Hence the correct option is (d).