Asked by Peter

The human eye responds to a light stimulus (generates a sensation of "light") upon receiving light energy of 10eV (and more). If we take 6000 angstroms as the average wavelength, how many photons must the eye receive to register a light sensation?
Answered by DrBob222
How much energy do you have in 6000 A?
E = hc/wavelength (w must be in meters) and E is then energy/photon.

Then convert 10 eV to joules, and
Joules = E/photon x # photons and solve for # photons.
Answered by Menes
PLS dR bob cna explain beter bcs i cant understand......thanks in advance
Answered by Peter
Hello Bob,

I calculated it without converting to Joules by taking the planck constant with the eV as unit, but i get around 4.84 photons, which seems to be wrong. Any ideas?
Answered by Dick
Pete, the dimensional analysis is wrong. You should just convert the eV to joules.
Answered by KS
even after converting to joules we get the same answer 4.835 which is wrong.
Answered by Dick
Guys, the mathematics is correct. Look at what is being asked. It's simple.
Answered by KS
Right... I was thinking the same along the lines of light is "quantized". Thanks!
Answered by Menes
Determine the linear density of atoms (atoms/m) along the [111] direction of gold at 300K.
Answered by Gabe
An eye doctor shines a bright light into a patient's eye. In one to two sentences, explain how the patient's brain perceives the bright light.(2 points) PLEASE ANSWER
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