The eyes of a certain member of the reptile family pass a visual signal to the brain when photons of wavelength 662.6 nm strike the receptors. If a total energy of 3.0 * 10^-14 J is required, what is

Question

The eyes of a certain member of the reptile family pass a visual signal to the brain when photons of wavelength 662.6 nm strike the receptors. If a total energy of 3.0 * 10^-14 J is required, what is the minimum number of photons that must strike the receptor?

Prashant Kotian · Accepted Answer

Correct answer: A. E_per_photon = hc/λ = (6.626*10^-34 * 3*10^8) / (662.6*10^-9) = 3*10^-19 J. n = 3*10^-14 / 3*10^-19 = 1.0*10^5.

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