Question

The band gap of a semiconductor is 1.4 eV. When an electron jumps from conduction band to the valence
band to recombine with a hole, what will be the maximum wavelength of the emitted radiation?
1) 5893Aº
2) 6700A
3) 8866Aº
4) 10015 Aº
nfonoh dindais non constant) The rms value of​

Answer 1

4 option 45of is a introduction description and conclusions

Answer 2

Answer:

The maximum wavelength of the emitted radiation will be 8866Aº.i.e.option(3).

Explanation:

The bandgap of semiconductor as per given in the question is,

$E=1.4eV$

We first have to convert eV it into Joule(J),

E=$1.4$×$1.6$×$10^{-19}$=$2.24$×$10^{-19}$J

For energy, we know that,

$E=hc$$/$λ       (1)

E= energy

h=planks contant=6.626×$10^{-34}$

λ= wavelength

we can write equation (1) as;

λ=$hc/E$   (2)

we will use the above equation (2) to find the wavelength,

λ=$6.626$×$10^{-34}$×$3$×$10^{8}$$/$$2.24$×$10^{-19}$

λ=$8.874$×$10^{-7}$m

λ=$8874$Aº

Hence, among the given option the closest option is (3) i.e.$8866$Aº. So, that will be our answer.