JEE Main 2019 Physics question

Surface of certain metal is first illuminated with light of wavelength = 350 nm and then, by light of wavelength = 540 nm. It is found that the maximum speed of the photo electrons in the two cases differ by a factor of 2. The work function of the metal (in eV) is close to: (Energy of photon = eV)

• (A)5.6
• (B)2.5
• (C)1.8Correct
• (D)1.4