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Photoelectric Effect and WaveParticle Duality — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsPhotoelectric Effect and WaveParticle Duality1 Mark
MCQ
Light of wavelength $\lambda$ falls on a metal having work function $\frac{\text{h}_\text{c}}{\lambda_0}.$ Photoelectric effect will take place only if:
  • A
    $\lambda\geq\lambda_0$
  • B
    $\lambda\geq2\lambda_0$
  • ✓
    $\lambda\leq\lambda_0$
  • D
    $\lambda<\frac{\lambda_ 0}{2}.$
✓

Answer

Correct option: C.
$\lambda\leq\lambda_0$
As the work-function of the metal is $\frac{\text{hc}}{\lambda_0}$, its threshold wavelength is $\lambda_0.$
For photoelectric effect, the wavelength of the incident light should be less than or equal to the threshold wavelength of the metal on which light is incident.

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