A source of sonic oscillations with frequency v 0 = 1700 Hz and a receiver are located on the same normal to a wall. Both the source and the receiver are stationary, and the wall recedes from the source with velocity u = 6.0 m/s. Find the beat frequency (in Hz) registered by the receiver. The velocity of sound is equal to v = 340 m/s.
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(59)
frequency of direct sound received by observer = f
frequency of sound reflected by wall
f´ = 
frequency of this sound as received by observer
f× = 
= f 0 
= 1700 
= 1700 
Beat frequency = 
= 1700 
= 
× 12 ~ 59 Hz.
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