For LED's to emit light in visible region of electromagnetic light, it should have energy band gap in the range of :

Question

For LED's to emit light in visible region of electromagnetic light, it should have energy band gap in the range of : (A) 0.1 eV to 0.4 eV (B) 0.5 eV to 0.8 eV (C) 0.9 eV to 1.6 eV (D) 1.7 eV to 3.0 eV

Tardigrade Admin · Accepted Answer

The wavelength of electromagnetic radiation for it to lie in the visible region should lie in the range of 4000 A -7000 A. Using, E =( text hc /λ) and substituting the value of λ into the equation, we get the value of E to lie in between 1.7 to 3 eV

Q. For LED's to emit light in visible region of electromagnetic light, it should have energy band gap in the range of :

$0.1 e V$ to $0.4 e V$

$0.5 e V$ to $0.8 e V$

$0.9 e V$ to $1.6 e V$

$1.7 e V$ to $3.0 e V$

The wavelength of electromagnetic radiation for it to lie in the visible region should lie in the range of $4000 A - 7000 A$ . Using, $E = \frac{hc}{λ}$ and substituting the value of $λ$ into the equation, we get the value of $E$ to lie in between $1.7$ to $3 e V$

Q. For LED's to emit light in visible region of electromagnetic light, it should have energy band gap in the range of :

0.1eV to 0.4eV

0.5eV to 0.8eV

0.9eV to 1.6eV

1.7eV to 3.0eV

The wavelength of electromagnetic radiation for it to lie in the visible region should lie in the range of 4000A−7000A. Using, E=λ hc ​ and substituting the value of λ into the equation, we get the value of E to lie in between 1.7 to 3eV

$0.1 e V$ to $0.4 e V$

$0.5 e V$ to $0.8 e V$

$0.9 e V$ to $1.6 e V$

$1.7 e V$ to $3.0 e V$

The wavelength of electromagnetic radiation for it to lie in the visible region should lie in the range of $4000 A - 7000 A$ . Using, $E = \frac{hc}{λ}$ and substituting the value of $λ$ into the equation, we get the value of $E$ to lie in between $1.7$ to $3 e V$