A whistle giving out 450Hz approaches a stationary observer at a speed of 33m/s. The frequency heard by the observer in Hz is (speed of sound = 330m/s)

A whistle giving out 450Hz approaches a stationary observer at a speed

1.	A whistle giving out 450Hz approaches a stationary observer at a speed of 33m/s. The frequency heard by the observer in Hz is (speed of sound = 330m/s)
A.	409
B.	429
C.	517
D.	500
Answer» E.