In a photoelectric experiment ultraviolet light of wavelength 280 nm is used with lithium cathode having work function ϕ = 2.5 eV. If the wavelength of incident light is switched to 400 nm, find out the change in the stopping potential. (h = 6.63 × 10-34 Js, c = 3 × 108 ms-1)
1
1.3 V
2
1.9 V
3
0.6 V
4
1.1 V
5
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