devondehaven1933 devondehaven1933
  • 24-05-2023
  • Physics
contestada

The human eye can barely detect a star whose intensity at the earth's surface is 1.6\times10^{-11}\;{\rm W/m^{2}}
If the dark adapted eye has a pupil diameter of 6.0 {\rm mm}, how many photons per second enter the eye from the star? Assume the starlight has a wavelength of 550 {\rm nm}.

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