Radiation of wavelength 
, is incident on a photocell. The fastest emitted electron has speed v. If the wavelength is changed to 
, the speed of the fastest emitted electron will be:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
According to the law of conservation of energy, i.e, Energy of a photon 
Work function 
Kinetic- energy of the photoelectron ((1/2) 
)
According to Einstein's photoelectric emission of light,
If the wavelength of radiation is changed to 
, then
For fastest emitted electron,
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