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NEET2012PhysicsDual Nature of MatterActual

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 ~V . The threshold frequency of the material is

Options

  1. A4 10¹⁵ ~Hz
  2. B5 10¹⁵ ~Hz
  3. C1.6 10¹⁵ ~Hz
  4. D2.5 10¹⁵ ~Hz

Correct answer

C. 1.6 10¹⁵ ~Hz

Step-by-step solution

Energy released from emission of electron aligned E & =(-3.4)-(-13.6) & =10.2 eV aligned From photo electric equation. Work function aligned & =E-e V=h v v & = E-e V h & = (10.2-3.57) e 6.67 10⁻³⁴ v & = 6.63 1.6 10⁻¹⁹ 6.67 10⁻³⁴ & =1.6 10¹⁵ ~Hz aligned

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