The number of electrons excited in an element of band gap 2.12 eV is 2.09 x106.Calculate the frequency of the photon that is required to excite the electrons from conduction band to valence band. (a) 1.07x102 Hz (b) 10.7 x102 Hz (c) 9.31x102 Hz (d) 7.08x102 Hz X
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