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CGP EDU Academic Team
Published on: August 13, 2026
Surface of certain metal is first illuminated with light of wavelength 
and then, by light of wavelength 
. It is found that the maximum speed of the photo electrons in the two cases differ by a factor of (2) The work function of the metal (in eV) is close to: (Energy of photon 
Text Solution
Verified by ExpertsThe correct answer is:
A
From Einstein's photoelectric equation,
…… ..(i)
……… .(ii)
As per question, maximum speed of photoelectrons in two cases differ by a factor 2
From eqn. (i) & (ii)
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