LED is constructed from Ga−As−P semiconducting material. The energy gap of this LED is 1.9eV. Calculate the wavelength of light emitted and its colour. [h=6.63×1034J s andc=3×108 ms−1]
A
654nm and red colour
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B
1046nm and blue colour
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C
1046nm and red colour
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D
654nm and orange colour
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Solution
The correct option is A654nm and red colour We know that E=hcλ