Question

Surface of certain metal is first illuminated with light of wavelength λ₁ = 350 nm and then, the light of wavelength λ₂ = 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 = 1240/λ(in nm) ]eV
(A) 1.8 (B) 2.5
(C) 5.6 (D) 1.4
[JEE Main 2019]

Answer 1

Answer:

Hey bro the correct answer is 1.06

Explanation:

Mark the answer brainliests please

Answer 2

answer is 2.5

Explanation:

becouse wavelength has momentum