Question

LED is made up of Gallium Arsenide, emits yellow light of wave length 5850Aº Calculate

the energy band gap of material.



A)

19 1.808 10 J −



B)

21 2.188 10 J −



C)

31 1.800 10 J −



D) 3.11J

​

Answer 1

Explanation:

answer is 21 2.188 10 J hope help

Answer 2

Answer:

The energy bandgap of the material is 3.4×10⁻¹⁹J.

Explanation:

The energy bandgap of the material can be calculated as,

$E=\frac{hc}{\lambda}$      (1)

Where,

E=band gap energy of the material

h=planck's constant=6.626×10⁻³⁴Joule-Second

c=speed of light in vacuum=3×10⁸m/s

λ=wavelength of the light that is used

From the question we have,

λ=5850A°=5850×10⁻¹⁰m

By substituting the required values in equation (1) we get;

$E=\frac{6.626\times 10^-^3^4\times 3\times 10^8}{5850\times 10^-^1^0}$

$E=0.0034\times 10^-^1^6$

$E=3.4\times 10^-^1^9J$

Hence, the energy bandgap of the material is 3.4×10⁻¹⁹J.