Verify that the photon energy is 225ev how many, Physics

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Verify that the photon energy is 225ev how many

Si, GaAs and CdS crystals are exposed to a yellow light of wavelength 5500A and intensity 10¹² photons/cm²-sec. Verify that the photon energy Is 2.25eV. How many electron-hole pairs are generated per unit volume per second in each crystal?

Assume that crystal is very thin and the light is absorbed uniformly in the very thin slice. Why do we need to assume the crystal to be very thin? (Use λ-1.24/E and Figure given) (Partial answer: Si, 7x10¹⁵cm^-3s^-1.)

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