The Andromeda Nebula, at a distance of 2 x 1022 m from the Earth, radiates 8 x
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The Andromeda Nebula, at a distance of 2 x 1022 m from the Earth, radiates 8 x 1027 W in the spectral line of frequency 1420 MHz. Estimate the number of photons received per second when the nebula is observed by a radio telescope of collecting area 100 m2.
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The energy of a photon of frequency v is hi so if the nebula radiates a power P this must c...View the full answer
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