Question

Determine the wavelength of light emitted by LED having band gap

Answer 1

Answer:

Explanation:

If an LED has to emit 662nm wavelength of light them what should be the band gap energy of its semiconductor? h=6.62×10  

−34

Js.

EASY

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ANSWER

Given:

λ=662nm

As

Energy gap=E=  

λ

hc

​  

 

E=  

662×10  

−9

 

6.62×10  

−34

×3×10  

8

 

​  

 (as c=3×10  

8

)

E=3×10  

18

V

Hence the correct answer =3×10  

18

V