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Introductory Physics Homework Help
Doppler effect in different scenarios
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[QUOTE="andrewkirk, post: 5462677, member: 265790"] For (a) the reflected frequency is the frequency 'heard' by the wall, which is the number given in formula (1) with car as source and wall as observer (260Hz). The wall then emits as an echo the 260Hz frequency it 'hears' and, as the observer and the wall are both stationary, that's the freq the observer hears. For c, you have a stationary source emitting 260Hz and the driver as observer moving towards it at speed 5m/s. You apply formula (3) with ##V_O=5,V_S=0,f=260## and you'll get the right answer. That's the same as what you get if you replace the source and its frequency by a virtual car that is the mirror image of the real car in the wall, with the virtual car moving towards the real one at a speed of 5m/s (rel to the ground) and emitting a 256Hz horn sound. So it all works out. [/QUOTE]
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Doppler effect in different scenarios
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