When radiation of wavelength \( \lambda \) is incident on a metallic surface, the stopping poten....

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When radiation of wavelength \( \lambda \) is incident on a
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metallic surface, the stopping potential is 4.8 volts.
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If the same surface is illuminated with radiation of double the wavelength, then the stopping potential becomes 1.6 volts. Then the threshold wavelength for the surface is \( n \lambda \). Find the value of \( \mathrm{n} \)


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