Qstnid -Ii-7-light Of Wavelength Λ Falls On A Metal With Work-function Hc/λ<sub>0</sub>. Photoelectric Effect Will Take Place Only If - 42: Photoelectric Effect And Wave Particle Duality - Neet-xii-physics

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NEET-XII-Physics

42: Photoelectric Effect and Wave Particle Duality

with Solutions - page 2

Qstn# ii-7 Prvs-Qstn Next-Qstn

#7
Light of wavelength λ falls on a metal with work-function hc/λ₀. Photoelectric effect will take place only if
(a) λ ≥ λ₀
(b) λ ≥ 2λ₀
(c) λ ≤ λ₀
(d) λ < λ₀/2
digAnsr: c
Ans : (c) λ ≤ λ₀
As the work-function of the metal is hc/λ₀, its threshold wavelength is λ₀.
For photoelectric effect, the wavelength of the incident light should be less than or equal to the threshold wavelength of the metal on which light is incident.
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