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A sourse of gamma quanta is placed at a height h= 20m above an absorber. With what velocity should the source be displaced upward to counterbalance completely the gravitational variation of gamma quanta energy due to the Earth's gravity at the point where the absorber is located? |
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Answer» Solution :Because of the gravitational shift the FREQUENCY of the gamma ray at the location of the absorber in increased by `(delta omega)/(omega)=(gh)/(c^(2))` For this to be compensated by the Doppler shift (assuming that resonant absorption is possible in the ABSENCE of gravitational field) we MUST have `(gh)/(c^(2))=(V)/(c ) or v(gh)/(c )= 0.65 mu m//s` |
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