Questions
The semi conductors used for fabrication of visible LED (light emitting diode) must have at least a band gap of
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a
1.95 eV
b
1.75 eV
c
1.45eV
d
1.8eV
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Correct option is D
Visible light is from 400nm to 700nm i.e. from about 3 eV to 1.8eVSimilar Questions
Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed ?
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