Which pre-assumptions are used for the Dopple | vedclass

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(D) The Doppler effect describes the change in frequency of a wave in relation to an observer who is moving relative to the wave source. The standard

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(D) The Doppler effect describes the change in frequency of a wave in relation to an observer who is moving relative to the wave source. The standard pre-assumptions (conditions) for the derivation of the Doppler effect formula are:$(1)$ The medium through which the sound travels is stationary.$(2)$ The velocities of the source and the observer are significantly less than the velocity of sound in the medium $(v_s, v_o $(3)$ The motion of the source and the observer is along the straight line joining them.$(4)$ The observer is capable of hearing the sound.

Which pre-assumptions are used for the Doppler effect?

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