Question

if the max kinetic energy of emitted photo electrons from a metal is 0.9eV and work function is 2.2eV,then the wavelength of incident radiation is​

Answer 1

I don't understand the question

Answer 2

Answer:

The energy of emitted photoelectrons from a metal is 0.9 eV. The work function of the metal is 2.2 eV. Then the energy of the incident photon is :

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ANSWER

Energy of incident photon = energy of emitted photoelectrons + work function

=2.9eV+2.2eV

=3.1eV

So, the answer is (D).

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