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An object is moving at a velocity of 225 m/s, emitting a sound at 343 Hz....

An object is moving at a velocity of 225 m/s, emitting a sound at 343 Hz. The observer is stationary. What is the observed frequency as the source approaches the observer? What is the observed frequency after the source passes the observer?

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Answer #1

Doppler Equation for stationary observer is given by,

where,

f is the actual frequency = 343 Hz

v is the velocity of sound in air = 343 m/s

v_s = velocity of source : When approaching v_s = - 225 m/s & When approaching v_s = + 225 m/s

When object is approaching : Obsereved Frequency   

When object is passing away : Obsereved Frequency   

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