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11. Dual nature of radiation and matter — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics11. Dual nature of radiation and matter1 Mark
MCQ
Five elements $A, B, C, D$ and $E$ have work functions $1.2\, eV, 2.4\, eV, 3.6\, eV, 4.8\, eV$ and $6\, eV$ respectively. If light of wavelength $4000\, Å$ is allowed to fall on these elements, then photoelectrons are emitted by
  • A
    $A, B$ and $C$
  • B
    $A, B, C, D$ and $E$
  • ✓
    $A$ and $B$
  • D
    Only $E$
✓

Answer

Correct option: C.
$A$ and $B$
c
(c) $E = \frac{{12375}}{{4000}} = 3.09\,eV$ Photoelectrons emits if energy of incident light $>$ work function.

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