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Dual Nature Of Radiation

JEE Main 2021 (Online) 25th July Evening Shift

MCQ+4 / -12021
When radiation of wavelength \(\lambda\) is incident on a metallic surface, the stopping potential of ejected photoelectrons is 4.8 V. If the same surface is illuminated by radiation of double the previous wavelength, then the stopping potential becomes 1.6 V. The threshold wavelength of the metal is :

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