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2. structure of atom — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
Photoelectric effect is the phenomenon in which
  • A
    Photons come out of a metal when it is hit by a beam of electrons.
  • B
    Photons come out of the nuclues of an atom under the action of an electric field
  • C
    Electrons come out of a metal with a constant velocity which depends on the frequency and intensity of incident light wave.
  • ✓
    Electrons come out of a metal with different velocities not greater than a certain value which depends only on the frequency of the incident light wave and not on its intensity.
✓

Answer

Correct option: D.
Electrons come out of a metal with different velocities not greater than a certain value which depends only on the frequency of the incident light wave and not on its intensity.
d
Total energy $= PE + KE$

$KE _{\max }= T ($ total energy)

So, velocity cannot be greater than velocity corresponding to $KE _{\max }$.

The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to incident light. The energy contained within the incident light is absorbed by electrons within the metal, giving the electrons sufficient energy to be 'knocked' out of, that is, emitted from, the surface of the metal.

$h \nu=h \nu o+K E$

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