Verified Solution • 2025–26 Session moderate

QJEEM22Chd834: JEE Main 2022 Chemistry - Class 11 JEEM22Chd834 Solution: If the work function of a metal is 6.63 10 19 J, the maximum…

If the work function of a metal is 6.63 ×\times 10 −- 19J, the maximum wavelength of the photon required to remove a photoelectron from the metal is ____________ nm. (Nearest integer)

[Given : h = 6.63 ×\times 10 −- 34 J s, and c = 3 ×\times 108 m s −- 1]

Step-by-Step Verified Solution

Given,

Work function = 6.63 ×\times 10 −- 19 J

=6.63×10−191.6×10−19= {{6.63 \times {{10}^{ - 19}}} \over {1.6 \times {{10}^{ - 19}}}}

= 4.14 eV

We know,

E=1240λ (nm)E = {{1240} \over {\lambda \,(nm)}}

⇒4.14=1240λ\Rightarrow 4.14 = {{1240} \over \lambda }

λ\lambda = 300 nm

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