CBSE Class 12 Physics 2023 Outside Delhi Set 2 Paper

Question : 7 of 13

Marks: +1, -0

A photon of wavelengths

663 {\nm}

is incident on a metal surface. The work function of the metal is

1.50 {\eV}

. The maximum kinetic energy of the emitted photo electrons is

Solution:

\;h v=ϕ_0+K E_{\max }

or,

\;\;{h c}/{λ}=ϕ_0+K E_{\max }

or,

\;{6.62 × 10^{-34} × 3 × 10^8}/{663 × 10^{-9}}

=1.5 × 1.6 × 10^{-19}+ {\KE}_{\max }

∴ \;\; K E_{\max }\;=0.6 × 10^{-19}

\;=6 × 10^{-20} {\J}

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