When a train, blowing its whistle, approaches him, the pitch of the wh – McqOptions

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1.	When a train, blowing its whistle, approaches him, the pitch of the whistle appears to rise and it appears to drop as the engine moves away from him. What is the effect observed here?
A.	Doppler effect
B.	Frequency effect
C.	Beats
D.	Echelon effect
Answer» B. Frequency effect

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