An LED is constructed from a pn junction based on a certain semi-conducting material whose energy gap is 1.9eV. Then the wavelength of the emitted light is
A
2.9×10−9m
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B
1.6×10−8m
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C
6.5×10−7m
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D
9.1×10−5m
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Solution
The correct option is C6.5×10−7m Energy gap Eg=1.9eV
Wavelength of light emitted λ=hcEg nm where hc=1240eV