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The Andromeda Nebula, at a distance of 2 x 102 m from the Earth, radiates 8 x 107 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 m?.

The Andromeda Nebula, at a distance of 2 x 102 m from the Earth, radiates 8 x 107 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 m?.

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The Andromeda Nebula, at a distance of 2 x 102m from the Earth, radiates 8 x 10 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 m?.
Transcribed Image Text:The Andromeda Nebula, at a distance of 2 x 102m from the Earth, radiates 8 x 10 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 m?.
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