Electronic Devices and Circuits - Engineering

Q1:

A particular green LED emits light of wavelength 5490, Å, the energy bandgap of the semiconductor material used there is .. h = 6.6 x 10-34 J sec.

A 2.26 eV

B 1.98 eV

C 1.17 eV

D 0.74 eV

ANS:A - 2.26 eV

From Plank equation joule to convert it into electron volt it will be divided by 1.6 x 10-19.