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JEE Main 202122 JulyMorning Shift

Exam: JEE Main
Year: 2021
Date: 22 July
Shift: Morning Shift
Subject: Physics
Chapter: Semiconductors

JEE Main 2021 · 22 July · Morning Shift · Physics · Semiconductors

Consider a situation in which reverse biased current of a...

Consider a situation in which reverse biased current of a particular

P - N

junction increases when it is exposed to a light of wavelength

\le 621nm .

During this process, enhancement in carrier concentration takes place due to generation of hole-electron pairs. The value of band gap is nearly.

Options

A $2eV$
B $4eV$
C $1eV$
D $0 . 5eV$

Correct answer

A. $2eV$

Step-by-step solution

Band gap $= \dfrac{hc}{{\lambda}_{0}}$ ,
where ${\lambda}_{0} -$ threshold wavelength

Band gap $= \dfrac{1242ev - nm}{621nm} = 2eV$

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