Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12

# A Non-monochromatic Light is Used in an Experiment on Photoelectric Effect. the Stopping Potential - Physics

MCQ

A non-monochromatic light is used in an experiment on photoelectric effect. The stopping potential

#### Options

• is related to the mean wavelength

•  is related to the longest wavelength

• is related to the shortest wavelength

• is not related to the wavelength

#### Solution

is related to the shortest wavelength

For photoelectric effect to be observed, wavelength of the incident light (λ) should be less than the threshold wavelength (λ_0) of the metal .

Einstein's photoelectric equation :

eV_0 = (hc)/(λ_0) - varphi

Here, V0 = stopping potential

λ_0 = threshold wavelength

h = Planck's constant

varphi = work-function of metal
It is clear from the above equation that stopping potential is related to the shortest wavelength (threshold wavelength).

Concept: Einstein’S Photoelectric Equation: Energy Quantum of Radiation
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#### APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 20 Photoelectric Effect and Wave-Particle Duality
MCQ | Q 13 | Page 264