5 Two different sound sources S1 and S2have frequencies in the ratio 1:2 source s1is approaching towards observer and s2 - Physics - Electromagnetic Waves

Question

5 Two different sound sources S1 and S2have frequencies in the
ratio 1:2 source s1is approaching towards observer and s2 receding
from same observer speeds of both s1 and s2 are V each and speed of
sound air is 330m/s If no beats are heard by the observer then the
value of V is------

Neha Gupta · Accepted Answer

Actual frequency of the first source is f0actual frequency  of the second source is 2f0
apparent frequency of the sound when listner is at rest
f = vv-vs×f0v is the velocity of soundvs is the velocity of sourcefor source s1f1 = vv-vs×f0for source s2 which is moving away from the listnerf2 =vv+vs×2f0for no beat frequency  f1 -f2 = 0 vv-vs×f0-vv+vs×2f0 = 0vv+vs×2f0 = vv-vs×f02(v-vs) = v+vsv = 3vsvs = v3

5.Two different sound sources S1 and S2have frequencies in the ratio 1:2.source s1is approaching towards observer and s2 receding from same observer.speeds of both s1 and s2 are V each and speed of sound air is 330m/s.If no beats are heard by the observer then the value of V is------