The energy gap for a semiconductor is 1.25 eV.Of the frequencies given below,what is the minimum frequency photon than can move an electron from the valence band to the conduction band?

Question

Quizplus · Accepted Answer

The minimum energy required to move an electron from the valence band to the conduction band is equal to the energy gap of the semiconductor, which is given as 1.25 eV. Using the relation E = hf, we can calculate the corresponding frequency as f = E/h, where h is the Planck's constant. Substituting the values, we get:

f = (1.25 eV)/(4.135 x 10^-15 eV s) = 3.02 x 10^14 Hz

Among the given options, only option B has this frequency or higher, which means it contains a photon that can move an electron from the valence band to the conduction band. Therefore, the minimum frequency photon is given by choice B.

The Energy Gap for a Semiconductor Is 1