Question

A source of sound of frequency 150 Hz is moving in a direction towards an observer with velocity 110 m/s. if the velocity of sound is 330 m/s, what will be the frequency of sound heard by the person?

Answer 1

frequency = 450 Hz as i find lambda and it is 11/15

Answer 2

Answer: n'=n(velocity of sound/velocity of sound - Velocity of Source)

n'=n(v/v-Vs)

n' = 150 (330/330-110)

n' = 225 hz (Ans)