Question

# Photoelectric work function of a metal is 1 eV. Light of wavelength λ=3000oA falls on it. The photoelectrons come out with velocity :

A
10ms1
B
103ms1
C
104ms1
D
106ms1
Solution
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#### The Einstein's equation for photoelectric effect is given by , Kmax=hν−Wor 12mv2=hcλ−Wor v=√2(hc/λ−W)m=√2[(6.62×10−34×3×108)/(3000×10−10)−(1×1.6×10−19)]9.1×10−31 =1.04×106m/s∼106m/s (where mass of electron m=9.1×10−31kg)

3
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