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NEET2011PhysicsDual Nature of MatterActual

An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photo-sensitive material having work function 2.75 eV . If the stopping potential of the photo-electron is 10 ~V , the value of n is

Options

  1. A3
  2. B4
  3. C5
  4. D2

Correct answer

A. 3

Step-by-step solution

aligned E & = KE _ +W & =e V₀+W & =10+2.75 E & =12.75 eV aligned Difference of 4 and 1 energy level is 12.75 eV . So, higher energy level is 4 to ground and excited state is n=3 .

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