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What is apparent change in pitch of a sound caused by the motion of the object making the sound?
Wiki User
∙ 14y ago
this is the Doppler effect where sound waves are compressed in front of a moving object and exapnded behind it. Thus the pitch appears higher as an object approaches than when it receeds. At just below Mach 1, the sound wave is compressed to twice the frequency so the Doppler shift would be almost 2 octaves (factor of 4 between compresson and expansion) as the object passed.
Wiki User
∙ 14y ago
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