Question

The energy gap of an element is given as 5.9x10* ev. Calculate the intrinsic coherent length if V = 5.82x10 m/s.

(a) 5.9 pm

(b) 1.2 m

(c) 9.5 mm

(d) 2.1 um​

Answer 1

Answer:

The energy gap of an element is given as 5.9x104 eV. Calculate the intrinsic coherent length if V, = 5.82x109 m/s. (a) 5.9 mm (b) 1.2 mm (e) 9.5 Lan (d) 2.1 am Answer C.

Answer 2

Given :

$\displaysyle E_g$ = 5.9x10* ev

V = 5.82x10 m/s

To find:

ξ =?

Explanation:

The intrinsic coherent length of an element is given by

$\displaystyle \xi _0 = \frac{2 \hbar V}{E_g}$

where

$\displaystyle \hbar = \frac{h}{2\pi }$

where ' h ' is Plank's constant & its value is 6.62 $\times 10 ^{-34$  $m^2$kg/s.

$\displaystyle \xi _0 = \frac{2 h V}{2\pi E_g}$

$\displaystyle \xi _0 = \frac{ h V}{\pi E_g}$

$\displaystyle \xi _0 = \frac{ 6.62 \times 10^{-34} \times 5.82\times 10^ }{3.14 \times5.9\times10}$

    = 2.0796 $10^{-6$ m

∴  $\displaystyle \mathbf { \xi_0 = 2.1 }$ μm

∴