New answers tagged doppler-effect
[Note: Since the statement of the question, including the recent "Edit" after comments, already generally describes how to obtain the solution, my following answer is largely limited to pointing out some remaining mistakes; at least unless requested otherwise.] The observed wavelength for the photon coming towards the observer ... more specificly: ...
the medium doesn't matter for Doppler effect. what matters is the finite speed of sound or light in this case. if you're moving towards the source of signal, due to the finite speed of light, you'll get the peaks in signal more frequently than if you were standing still.
The difference is that the classical Doppler effect assumes a static background. In atmosphere, there is a marked difference between a moving observer and a stationary one - a gentle (or not so gentle) breeze. To exaggerate these effects, consider two jets flying above mach 1. If the first jet is ahead of a second, the first jet will not hear any of the ...
You are right that there are two effects at play here. Firstly, suppose that we turn relativity off --- suppose that we consider our universe to be Newtonian, with a finite speed of light propagation. It would indeed be the case that if an observer A were moving relative to another observer B, and emitting a light signal towards B, then the rate at which ...
The extra energy comes from the kinetic energy of the moving car. The radiated light is carrying away some momentum and is decreasing the speed (and therefore kinetic energy) of the car.
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