A source of sound and a listener are approaching each other with a speed of 40ms-1.The apparent frequency of a note produced by the source is 400 Hz. Then its true frequency is (velocity of sound in air = 360 ms-1)
A. 320 Hz
B. 400 Hz
C. 360 Hz
D. 420 Hz
Answer:A
A source of sound and a listener are approaching each other with a speed of 40ms-1.The apparent frequency of a note produced by the source is 400 Hz. Then its true frequency is (velocity of sound in air = 360 ms-1)
A. 320 Hz B. 400 Hz C. 360 Hz D. 420 Hz