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Home Q & A Board Science-Related Homework Help Physics
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mcyyan mcyyan
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8 years ago
The human eye can detect as few as 9080 photons per second entering the pupil. About how much energy is this, per second? (Assume the photons have a wavelength of 340 nm.)
  J
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#1
8 years ago Edited: 8 years ago, Biomedicine
wavelength λ=340nm, c=speed of light, v=frequency of photon, h= plank's constant
you know the formulas: c=λ*v, and E=h*v. c and h should be given, so you can easily solve the system.

alternatively, you can just use the formula E=(h*c)/λ

That way you will find the energy of a single photon. You must multiply this result with 9080 to find the answer. (Also, remember to modify wavelength to meters and speed of light to m/s before you make any calculations).
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