When monochromatic light of wavelength ' 
' is incident on a metallic surface, the stopping potential for photoelectric current is ' 
'. When same surface is illuminated with light of wavelength ' 
', the stopping potential is ' 
'. The threshold wavelength for this surface when photoelectric effect takes place is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
According to Einstein's photoelectric equation 
where 
Stopping potential
Incident wavelength
Threshold wavelength
or 
For the first case
For the second case
Divide eqn. (i) by (ii), we get
or 
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