LED is constructed from Ga - As - P semiconducting material. The...

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 \times {10}^{- 34}J - s

and

c = 3 \times {10}^{8}m{s}^{- 1}

Options

A $654nm$ and red colour
B $654nm$ and orange colour
C $1046nm$ and red colour
D $1046nm$ and blue colour

Correct answer

A. $654nm$ and red colour

Step-by-step solution

$\lambda = \dfrac{hc}{E} = \dfrac{6 . 6 \times {10}^{- 34} \times 3 \times {10}^{8}}{1 . 9 \times 1 . 6 \times {10}^{- 19}} = 6 . 54 \times {10}^{- 7}$

$= 654nm$

Red color

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