Electrons are emitted from a certain metal with a maximum kinetic energy of 2 eV

Question

Electrons are emitted from a certain metal with a maximum kinetic energy of 2 eV when 6-eV photons are incident on its surface.If photons of twice the wavelength are incident on this metal which one of the following statements is true? (show your work)
A) No electrons will be emitted.
B) Electrons will be emitted with a maximum kinetic energy of 3 eV.
C) Electrons will be emitted with a maximum kinetic energy of 6 eV.
D) Electrons will be emitted with a maximum kinetic energy of 9 eV.
E) Electrons will be emitted with a maximum kinetic energy of 12 eV.

Explanation / Answer

W0 =6-2 = 4eV

Now =hC/E

Since is doubled E will be half , 3 eV

So no electrons will be emitted

Ans is A

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