Q. 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 = 
Js, c = 
)
(1) 1.3 V
(2) 1.1 V
(3) 1.9 V
(4) 0.6 V (JEE-2021)
Aditya Bhatt Answered question 30 January 2024
