A flat-screen photodetector continuously absorbs energy from a plane wave (frequency ) when the wave strikes the
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A flat-screen photodetector continuously absorbs energy from a plane wave (frequency ω) when the wave strikes the screen (area A) at normal incidence. Use the lab frame (where the detector is at rest) and a frame moving uniformly in the direction of the wave to study the total energy UEM absorbed by the detector in a finite time interval. Deduce thereby that the ratio UEM/ω is a Lorentz invariant scalar.
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Lets start by analyzing the situation in both the lab frame rest frame of the detector and the frame moving uniformly in the direction of the plane wave Well then deduce the total energy absorbed by t...View the full answer
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