3) whers a 6000 À°
light falls on the cathod of o
photo tell and produced photes emission of a
stopping potential of 0.8 0 is required
2 freequency of the light
ii
energy of the incident photos
work function of the Cathode material
in) threshold freequency
u) net energy of the electrons after it leaves the surface
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12th
Physics
Dual Nature of Radiation and Matter
Photocell and Probability Interpretation to Matter Waves
The stopping potential for ...
PHYSICS
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Asked on December 30, 2019 by
Nayan Mithbavkar
The stopping potential for a photo cell depends
A
On the nature of the cathode and intensity of light
B
On both the intensity and frequency of incident light
C
Only on the intensity of light
D
On both the nature of the cathode and frequency of incident light
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ANSWER
It is known that the stopping potential of a metal is the potential required to stop the fastest electron emitted from its surface due to the photoelectric effect.
If q
e
is the charge on the electron and V
o
is the stopping potential, then we have
q
e
V
o
=K
max
where K
max
is the maximum kinetic energy of the emitted electrons.
Recalling the photoelectric effect, we know that
K
max
=h(f−f
o
)
where hf
o
is the work function of the metal and f
o
is its threshold frequency. From the above two equations, it can be observed that the stopping potential of a metal depends on:
(i) frequency f of the incident light and
(ii) work function which in turn means the nature of the cathode (metal)...
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