LED is constructed from Ga -As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour. [ h =6.63 × 10-34 Js . and . c =3 × 108 ms -1]

Question

LED is constructed from Ga -As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour. [ h =6.63 × 10-34 Js . and . c =3 × 108 ms -1] (A) 1046 nm and red colour (B) 654 nm and orange colour (C) 1046 nm and blue colour (D) 654 nm and red colour

Tardigrade Admin · Accepted Answer

λ=( hc / E )=(6.6 × 10-34 × 3 × 108/1.9 × 1.6 × 10-19)=6.54 × 10-7 =654 nm Red color

Q. LED is constructed from $G a$ -As-P semiconducting material. The energy gap of this LED is $1.9 e V$ . Calculate the wavelength of light emitted and its colour. $[h = 6.63 \times 1 0^{- 34} J s$ and $c = 3 \times 1 0^{8} m s^{- 1}]$

$1046 nm$ and red colour

$654 nm$ and orange colour

$1046 nm$ and blue colour

$654 nm$ and red colour

$λ = \frac{h c}{E} = \frac{6.6 \times 1 0 ^{- 34} \times 3 \times 1 0 ^{8}}{1.9 \times 1.6 \times 1 0 ^{- 19}} = 6.54 \times 1 0^{- 7}$
$= 654 nm$
Red color

Q. 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=6.63×10−34Js and c=3×108ms−1]

1046nm and red colour

654nm and orange colour

1046nm and blue colour

654nm and red colour