Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The work functions of two metals ( 
and 
) are in the 
ratio. When these metals are exposed to photons of energy 6 eV, the kinetic energy of liberated electrons of 
is in the ratio of 
. The work functions (in eV) of 
and 
are respectively.
A
B
C
D
3.1, 6.2
Text Solution
Verified by ExpertsThe correct answer is:
B
The work functions satisfy 
.
Let 
and 
.
Using the photoelectric equation
, we have 
and 
.
Given the kinetic energy ratio 
, we get 
.
Solving: 
gives 
So 
and 
.
Thus 
and 
.
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