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Question

An LED is constructed from a pn junction based on a certain semi-conducting material whose energy gap is 1.9 eV. Then the wavelength of the emitted light is

A
2.9×109m
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B
1.6×108m
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C
6.5×107m
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D
9.1×105m
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Solution

The correct option is C 6.5×107m
Energy gap Eg=1.9eV
Wavelength of light emitted λ=hcEg nm where hc=1240eV
λ=12401.9650 nm =6.5×107 m

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