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When an object approaches you at Ma = 0.8, you can hear
it, according to Fig. But would there be a Doppler
shift? For example, would a musical tone seem to you to
have a higher or a lower pitch?
For , the displacement experienced by the sound waves is larger than the displacement experienced by the object transmitting the sound waves. The sound waves move quicker than the particle is all directions, and hence, a person would register the sound waves before the particle approaches him. So whether the object is approaching, passing or going away from a person, he hears the sounds waves with the same intensity. Hence, there would not be a Doppler shift.
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