AIPMT | 2015Photoelectric EffectEasy
Question
A certain metallic surface is illuminated with monochromatic light of wavelength, λ. The stopping potential for photo-electric current for this light is 3V0. if the same surface is illuminated with light of wavelength 2λ, the stopping potential is V0. The threshold wavelength for this surface for photoelectric effect is :-
Options
A.4 λ
B.
C.
D.6 λ
Solution
Stopping potential = Incident energy - Emitted energy
Emitted energy is constant in both case hc/λ0 (λ0 = thresold wavelegth )
φ = hc/λ - hc/λ0
φ = hc/2λ - hc/λ0
λ0 = 4λ
Thus option A is correct
Create a free account to view solution
View Solution FreeMore Photoelectric Effect Questions
In an microscope the accelerating voltage is increased from 20 kV to 80 kV, the resovliving power of the microscope will...An electron of mass m with an initial velocityV→=Voi^Vo>Oenters an electric fieldE→=-Eoi^ (E0 = constant...A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoe...According to the modern theory for nature of light, the light has....When a monochromatic source of light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and the sa...