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

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#### 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, *V*_{0} = 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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