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JEE Main 2019 · 12 Jan · Shift I

JEE Main 2019 Chemistry question on Atomic Structure

What is the work function of the metal, if the light of wavelength 4000 Å generates photoelectron of velocity 6×1056 \times 10^5 ms−1^{-1} from it?

(Mass of electron =9×10−31= 9 \times 10^{-31} kg

Velocity of light =3×108= 3 \times 10^8 ms−1^{-1}

Planck's constant =6.626×10−34= 6.626 \times 10^{-34} Js

Charge of electron =1.6×10−19= 1.6 \times 10^{-19} JeV−1^{-1})
  1. A.
    4.0 eV
  2. B.
    2.1 eV
  3. C.
    0.9 eV
  4. D.
    3.1 eV
Show answer

Correct option: B

[JEE Main 2019 · 12 Jan · Shift I]

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