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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
A metal surface is exposed to solar radiations
  • ✓
    The emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations
  • B
    The emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiation
  • C
    The emitted electrons have zero energy
  • D
    The emitted electrons have energy equal to energy of photos of incident light
✓

Answer

Correct option: A.
The emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations
a
The emitted electrons have energy less than the maximum value of energy depending upon the frequency of the incident radiation.

As, $hv =h v_0+K . E .$

$\therefore K . E .= hv - hv _{ o }$

Since $h v_0$ is constant, the maximum $K.E.$ is always less than the maximum value of energy $(h v)$ depending upon the frequency of the incident radiation.

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