chemistry
posted 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?

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. 
PLS dR bob cna explain beter bcs i cant understand......thanks in advance

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? 
Pete, the dimensional analysis is wrong. You should just convert the eV to joules.

even after converting to joules we get the same answer 4.835 which is wrong.

Guys, the mathematics is correct. Look at what is being asked. It's simple.

Right... I was thinking the same along the lines of light is "quantized". Thanks!

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