Which pre-assumptions are used for Doppler effect ?

1.	Which pre-assumptions are used for Doppler effect ?
Answer» Solution :Following pre-assumptions will be used for RELATION between true frequency and experienced frequency. (1) Observer and source both should be in MOTION with respect to each other. (2) Velocity of source and observer should be less than velocity of sound. (3) Observers should be ABLE to hear.

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