A sound source is releasing a signal of constant frequency $$330$$ Hz. f& λare frequency and wavelength observed by an observer. The velocity of sound in air is $$330$$ ms−$$1$$.The observer and source are stationary, wind isblowing towards source from observer.The source is stationary, wind is blowing from source to observer and observer is moving away from the source.The source is stationary and observer is moving towards source.

Question

A sound source is releasing a signal of constant frequency $$330$$ Hz. f& λare frequency and wavelength observed by an observer. The velocity of sound in air is $$330$$ ms−$$1$$.The observer and source are stationary, wind isblowing towards source from observer.The source is stationary, wind is blowing from source to observer and observer is moving away from the source.The source is stationary and observer is moving towards source.

Infinity Learn · Accepted Answer

λ$$=vf=330330=1mP$$ : As source and observer are moving towards each other f′$$=f0u+u0u-usFrequency$$ increases and wavelength decreases.Q : As source and observer are at rest $$vO=0$$ and $$vS=0$$ wind is blowing from source to observer moving away from $$source=$$ f′$$=f0u+uw+u0u+uw-us=f0Frequency$$ remain same and wavelength also remain same.R : Observer is moving towards stationary $$source=$$  f′$$=f0u+uw-u0u+uwFrequency$$ decreases and wavelength remain same.S :  f′$$=f0u+u0uFrequency$$ increases and wavelength remain same.

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