The electric field at a point associated with a light wave is given by E = 200 sin 6 × 10 15 t + sin 9…

The electric field at a point associated with a light wave is given by
E=200sin6×1015t+sin9×1015t Vm-1

Given: h=4.14×10-15 eVs

If this light falls on a metal surface having a work function of 2.50 eV, the maximum kinetic energy of the photoelectrons will be

  1. 1.90 eV
  2. 3.27 eV
  3. 3.60 eV
  4. 3.42 eV

Solution

Given: E=200sin6×1015t+sin9×1015t V m-1

Here, angular velocity, ω1=6×1015 and ω2=9×1015

Maximum kinetic energy of the photoelectron is KEmax.=E-ϕ

=hf-ϕ=hω2π-ϕ

=4.14×10-15×9×10152×3.14-2.5=5.92-2.50=3.42 eV

Asked in: JEE Main 2022 (29 Jun Shift 2)

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