5. Calculate the longest wavelength of the incident
radiation, which will produce photoelectric effect
from a metal surface, whose work function is 2.2eV?
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Answer:
Maximum wavelength of photon which can eject electron from the metals. firstly we will find the kinetic energy.
Kinetic energy = energy of the incident light energy − work function
ii) ∴K.E
(max)
=3ev−2.4 ev
=0.6 ev
(i) E=
λ
hc
3=
λ
1.99×10
−25
[∴h is the plank's constant and c is the speed of light ]
λ=
3
1.99×10
−25
λ=0.663×10
−25
m.
(iii) now, retarding potential (V
0
) will be given by :
V
0
=
e
k
max
=
3
0.6
=0.2
V
0
=0.2 m/s
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