PPT Slide

Let source move at vS?0 towards stationary detector vD=0

Motion of S changes the wavelength of sound emitted

T=1/f is time between

emission of wavefronts

W1 and W2

In time T, W1 moves

distance vT and source

moves distance vST

At end of time T, W2 is

emitted

Distance bewteen W1 and W2

on right is ? ` = vT - vST

D detects f ` = v/ ? ` = f [v/(v-vS)]>f

higher frequency!

If source receding

f `= f [v/(v+vS)]<f

file://D:\applets\doppler\Doppler.html

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