Question

The cutoff wavelength for a photon able to create electron hole pair in a semiconductor having energy band gap of 1.6eV is :
(a) 7275 Å
(b) 8050 Å
(c) 7000 Å
(d) 7758 Å

Answer 1

Answer:

approx d will be the answer

Answer 2

Explanation

There is a wavelength and a frequency for every photon. The distance between two electric field peaks with the same vector is known as the wavelength. The number of wavelengths a photon travels across each second is what is known as its frequency. A photon cannot truly have a color, unlike an electromagnetic wave.

Now we know

E = H*C/λ

Therefore

1.6*1.6*10^-19 = 6.6*10-34*10^8 / λ

Therefore

λ= 6.6*10^-34*10^8/1.6*1.6*^10-19

Therefore λ = 7.7*10^-7

Hence the wavelength is 7758 Â

#SPJ3