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  4. If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 mathringA to 4000 mathringA then

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Q. If in a photoelectric experiment, the wavelength of incident radiation is reduced from $6000\,\mathring{A}$ to $4000\,\mathring{A}$ then

Dual Nature of Radiation and Matter

Solution:

Stopping potential $V_{0}=\frac{h c}{e}\left[\frac{1}{\lambda}-\frac{1} {\lambda_{0}}\right]$.
As $\lambda$ decreases so $V_{0}$ increases.