Verified Solution • 2025–26 Session moderate

QJEEM20Ph98c1: JEE Main 2020 Physics - Class 12 JEEM20Ph98c1 Solution: When the wavelength of radiation falling on a metal is changed…

When the wavelength of radiation falling on a metal is changed from 500 nm to 200 nm, the maximum kinetic energy of the photoelectrons becomes three times larger. The work function of the metal is close to :

Multiple Choice Options

  • A 1.02 eV
  • B 0.81 eV
  • C 0.61 eV
  • D 0.52 eV

Step-by-Step Verified Solution

K1 = hc500−ϕ0

K2 = hc200−ϕ0

∵ K2 = 3K1

⇒ 3[hc500−ϕ0]=[hc200−ϕ0]

⇒ ϕ0 = 0.61 eV

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