JEE Main 2021 Physics question

In a photoelectric experiment ultraviolet light of wavelength 280 nm is used with lithium cathode having work function = 2.5 eV. If the wavelength of incident light is switched to 400 nm, find out the change in the stopping potential. (h = Js, c = )

• (A)1.3 VCorrect
• (B)1.1 V
• (C)1.9 V
• (D)0.6 V