Question

Can geranium be used to detect infrared radiation emitted by a remote control device that has a wavelength of 902 nm? the work function (binding energy) of geranium is 7.61 x10^-19 J?
Oh, that Einstein guy again?

how much energy in a photon of wavelength 902 nanometers ?

approx 900*10^-9 = 9*10^-7 meter

L f = c
9*10^-7 f = 3*10^8
f= (1/3) * 10^15

E = h f
E = 6.6*10^-34 * (1/3)*10^15
E = 2.2 *10^-19

Nope not quite strong enough to spring an electron free.

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