PHOTOELECTRIC EFFECT Light with a photon energy of 5 eV impinges on the surface

Question

PHOTOELECTRIC EFFECT
Light with a photon energy of 5 eV impinges on the surface of a material with work function 1.6 eV to eject electrons. What is the kinetic energy of the outgoing electrons?

After light impinges on the surface of a material with work function 0.6 eV, the measured kinetic energy of the outgoing electrons is 2.4 eV. What is the photon energy of the incoming light?

Light with a photon energy of 5.5 eV impinges on the surface of a material and eject electrons with kinetic energy 3.9 eV. What is the work function of the material?

Explanation / Answer

(1) ans

Given that

photon energy E=5eV

wok function Wo=1.6eV

now we find the kinetic energy of outgoing electrons

kinetic energy K.E=5-1.6=3.4eV

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(2) ans

Given that

work function Wo=0.6eV

kinetic energy K.E=2.4eV

now we find the photon energy of incomeing light

photon energy =K.E+Wo=2.4+0.6=3 eV

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Given that

photon energy E=55eV

kinetic energy K.E=3.9eV

now we find the work function of material

work function Wo=E-K.E=5.5-3.9=1.6eV

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