a source of sound is apporcing of observer with speed of 30m/s and observer is apporcing the source with a speed of 50m/s find the fractional in form of sound? v=330
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Given, vs=30ms−1
v0=60ms−1
Apparent frequency v′=v[v+v0v−vs]
v′=v[330+60/330−30]
v′=v[390/330]
⇒v′=39/30v
∴ Fractional change in frequency
39/30v−v/v=9/30=3/10
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