QJEEM22Phcc29: JEE Main 2022 Physics - Class 12 JEEM22Phcc29 Solution: A metal exposed to light of wavelength 800   nm and and…

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QJEEM22Phcc29: JEE Main 2022 Physics - Class 12 JEEM22Phcc29 Solution: A metal exposed to light of wavelength 800   nm and and…

A metal exposed to light of wavelength $800 nm$ and and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of photo-electron doubles when light of wavelength $500 nm$ is used. The workfunction of the metal is : (Take hc $= 1230 eV - nm$ ).

Multiple Choice Options

A 1.537 eV
B 2.46 eV
C 0.615 eV
D 1.23 eV

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Accepted Answer

$∵$ $K_{m} = \frac{h c}{λ} - ϕ$

$\Rightarrow K = \frac{1230}{800} - ϕ$

and, $2 K = \frac{1230}{500} - ϕ$

$\Rightarrow 2 \times \frac{1230}{800} - 2 ϕ = \frac{1230}{500} - ϕ$

$\Rightarrow ϕ = 0.615 e V$

QJEEM22Phcc29: JEE Main 2022 Physics - Class 12 JEEM22Phcc29 Solution: A metal exposed to light of wavelength 800 &nbsp; nm and and…

Multiple Choice Options

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QJEEM22Phcc29: JEE Main 2022 Physics - Class 12 JEEM22Phcc29 Solution: A metal exposed to light of wavelength 800 nm and and…