If φ is the work function of photosensitive material in eV and light of wavelength of numerical value λ=(h c)/(e) metre, is incident on it with energy above its threshold value at an instant then the maximum kinetic

Correct answer: C. e-φ (K . E)_ =(h c)/(λ)-φ_0 and λ=(h c)/(e) (K . E)_ =(h c)/((h c)/(e))-φ_0 (K . E)_ =e-φ_0 (K . E .)_ =e φ

NEET 2024

Exam: NEET
Year: 2024
Subject: Physics
Chapter: Dual Nature of Matter

NEET 2024 · Physics · Dual Nature of Matter

If φ is the work function of photosensitive material in eV and...

\phi

is the work function of photosensitive material in eV and light of wavelength of numerical value

\lambda=\frac{h c}{e}

metre, is incident on it with energy above its threshold value at an instant then the maximum kinetic energy of the photo-electron ejected by it at that instant (Take

h

-Plank's constant,

c

-velocity of light in free space) is (in SI units):

Options

A $e+2 \phi$
B $2 e-\phi$
C $e-\phi$
D $e+\phi$

Correct answer

C. $e-\phi$

Step-by-step solution

(\mathrm{K} . \mathrm{E})_{\max }=\frac{h c}{\lambda}-\phi_0

and

\lambda=\frac{h c}{e}

\Rightarrow(\mathrm{K} . \mathrm{E})_{\max }=\frac{h c}{\frac{h c}{e}}-\phi_0

\Rightarrow(K . E)_{\max }=e-\phi_0 \Rightarrow(K . E .)_{\max }=e \dashv \phi

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