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JEE Main 202331 JanuaryEvening Shift

Exam: JEE Main
Year: 2023
Date: 31 January
Shift: Evening Shift
Subject: Physics
Chapter: Dual Nature of Matter

JEE Main 2023 · 31 January · Evening Shift · Physics · Dual Nature of Matter

If the two metals A and B are exposed to radiation of wavelength...

If the two metals

A

and

B

are exposed to radiation of wavelength

350nm

. The work functions of metals

A

and

B

are

4 . 8eV\text{and}2 . 2eV

. Then choose the correct option

Options

AMetal $B$ will not emit photo-electrons
BBoth metals $A$ and $B$ will emit photo-electrons
CBoth metals $A$ and $B$ will not emit photoelectrons
DMetal $A$ will not emit photo-electrons

Correct answer

D. Metal $A$ will not emit photo-electrons

Step-by-step solution

As we know, for photoelectric emission, $hν > ϕ$ .

Now,

$hν = \dfrac{hc}{\lambda} = \dfrac{1240}{350}eV = 3 . 54eV$

Therefore, only metal $B$ will emit photoelectrons.

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