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A small vibrating object on the surface of a ripple tank is the source of waves of frequency 20 Hz and speed 60 cm/s. If the source S is moving to the right, as shown, with speed 20 cm/s, at which of the labeled points will the frequency measured by a stationary observer be greatest?
(A) A
(B) B
(C) C
(D) D
(E) It will be the same at all four points.

A small vibrating object on the surface of a ripple tank is the source of waves of frequency 20 Hz and speed 60 cms If the source S is moving to the right as sh class=

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