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Materials and Components

Q1: The wavelength of light emitted by GaAs laser is 8670 x 10-10 m. If h = 6.626 x 10-34 Js, velocity of light = 3 x 108 m/s and eV = 1.602 x 10-19 J, the energy gap in GaAs is

A 0.18 eV

B 0.7 eV

C 1.43 eV

D 2.39 eV

ANS:C - 1.43 eV

Energy gap=hc/wavelength.
Where h is Planck's constant.
C is speed of light
And this ans is in joule then it will be changed in eV.



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