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Engineering Physics by S. Mani Naidu

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Solved Problems

1.    A semiconductor diode laser has a peak emission wavelength of 1.55 μm. Find its band gap in eV.

 

(Set-2–May 2008)

Sol: Energy gap of semiconductor, Eg = energy of emitted photon,

images where c = velocity of light = 3 × 108 m/s

Wavelength, λ = 1.55 μm = 1.55 × 16-6 m

Energy gap, Eg = ?

images

2.    Calculate the wavelength of emitted radiation from GaAs which has a band gap of 1.44 eV.

 

(Set-3–May 2008)

Sol: Energy gap of semiconductor, Eg =

h = Planck’s constant = 6.63 × 10-34 J-S

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