A photoelectric surface is illuminated successively by monochromatic light of wavelengths λ and λ2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface is :
hcλ
hc2λ
hc3λ
3hcλ
A
hc2λ
B
3hcλ
C
hcλ
D
hc3λ
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Solution
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The correct option is Ahc2λ K.Eλ=hcλ−ϕ K.Eλ/2=hcλ/2−ϕ K.Eλ/2=3(K.Eλ) ⇒ϕ=hc2λ
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Q1
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is (h = Planck's constant, c = speed of light)