In a photoelectric effect experiment the cathode metal is exposed to light of wavelength 
. The maximum kinetic energy of the ejected electron doubles when light of wavelength 
is used. The work function of the cathode metal is approximately. [Use 
]
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
From Einstein's photoelectric equation,
…… (i)
And given 
,
K.E. of electron 
Multiplying eq. (i) by 2,
Now subtracting eq. (iii), (ii)
Work function, 
.
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