JEE Main 9 Jan 2019 Shift 1 Solved Paper

Surface of certain metal is first illuminated withlight of wavelength λ1 = 350 nm and then , by light of wavelength λ2 = 54 D mm. It is found that the maximum speed of the photo electrons inthe two cases differ by a factor of 2. The workfunction of the metal (in eV) is close to :
(Energjr of photon =

1240

λ(in‌mm)

eV)