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JEE Main 25 July 2021 Shift 2 Solved Paper

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Question : 19

Total: 90

When radiation of wavelength λ is incident on a metallic surface, the stopping potential of ejected photoelectrons is 4.8V. If the same surface is illuminated by radiation of double the previous wavelength, then the stopping potential becomes 1.6V. The threshold wavelength of the metal is :

[25 Jul 2021 Shift 2]

2λ
4λ
8λ
6λ

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