A siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s. Frequency of the sound to be heard by the listener is (Take velocity of sound as 330 m/s)

A siren emitting sound of frequency 800 Hz is going away from a static

1.	A siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s. Frequency of the sound to be heard by the listener is (Take velocity of sound as 330 m/s)
Answer» `733.3 Hz ` `481.2 Hz` `644.8 Hz` `286.5 Hz` SOLUTION : We have `(F _(L))/( v + v _(L)) = (f _(S))/( v + v _(S ))` `THEREFORE (f _(L))/( 330 + 0) = (800 )/( 330 + 30)` `therefore f _(L) = 800 xx (330)/(360) = 733.3 Hz`