Question

The maximum kinetic energy of photoelectrons emitted from a metal surface is 6 eV, when
monochromatic light of wavelength λ falls on it. When the same surface is illuminated with light of 2λ ,
the maximum kinetic energy of photoelectrons is 1.5 eV. Calculate the wavelength λ and also calculate
the maximum wavelength of incident radiation for which photoelectrons can be emitted by this surface.
Given h=6.625×10-34
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Answer 1

Answer:

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Answer 2

Answer:

Given, the maximum kinetic energy: K

max

=4eV

If V

0

be the stopping potential, then K

max

=eV

0

⇒eV

0

=4eV

⇒V

0

=4V