A siren producing a sound of frequency 750 Hz moves away from an observer at rest towards a cliff at a speed of 30 m/s. The frequency of echo heard by the observer reflected from the cliff is[speed of sound in air =330 m/s)

A siren producing a sound of frequency 750 Hz moves away from an obser

1.	A siren producing a sound of frequency 750 Hz moves away from an observer at rest towards a cliff at a speed of 30 m/s. The frequency of echo heard by the observer reflected from the cliff is[speed of sound in air =330 m/s)
Answer» A siren producing a sound of frequency $750 Hz$ moves away from an observer at rest towards a cliff at a speed of $30 m/s$ . The frequency of echo heard by the observer reflected from the cliff is [speed of sound in air $= 330 m/s)$

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A siren producing a sound of frequency 750 Hz moves away from an observer at rest towards a cliff at a speed of 30 m/s. The frequency of echo heard by the observer reflected from the cliff is[speed of sound in air =330 m/s)

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