Numericals of Photo Electric Effect

PHOTOELECTRIC EFFECT

1. Electron with a kinetic energy of 6.023x104 J/mol are evolved from the surface of a metal, when exposed to a radiation of wavelength of 600 nm(Photoelectric effect). The minimum amount of energy required to remove an electron from the metal atom is.

2. A light whose frequency is equal to 6x1014Hz is incident on a metal surface whose work function is 2 eV. The maximum energy of the electron emitted will be. ( 1eV=1.6x10-19J)

3. A photon of energy 3.4 eV is incident on a metal surface having work function 2 eV. The maximum K.E. of photoelectron is equal to:

4. The threshold wavelength for a metal having a work function Wo is λo. What is the threshold wavelength for a metal whose work function is Wo/2:

5. The work functions of metals A and B are in the ratio 1:2. If light of frequencies f and 2f are incident on the surfaces of A and B respectively, the ratio of the maximum kinetic energies of photoelectrons emitted is.

6. If the energy of the photon corresponding to the wavelength 6000 Ao is 3.32x10-19J, the photo energy for a wavelength 4000 A0 will be:

7. Light of frequency 4f₀ is incident on a metal of the threshold frequency f₀. The maximum kinetic energy of the photoelectron emitted is:

8. The K.E. of the photon is E when the incident wavelength is λ/2. The kinetic energy becomes 2E when the incident wavelength is λ/3. The work function of the metal is:

9. Maximum kinetic energy of a photo electron is E when the wavelength of incident light is λ. If energy becomes four times when wavelength is reduced to one-third, then work function of the metal is:

10. Photoelectric work function of a metal is 1 eV. Light of wavelength λ=3000 A0 falls on it. The photo electron comes out with maximum velocity

11. The threshold wavelength for a metal whose work function is W₀ is λ₀. What is the threshold wavelength for a metal whose work function is W₀/4?

12. When a centimeter thick surface is illuminated with light of wavelength λ, the stopping potential 4V. When the same surface is illuminated by light of wavelength 2λ, the stopping potential is V/3. Threshold Wavelength of the metallic surface is:

13. The kinetic energy of an electron is E when the incident wavelength is λ. To increase the K.E of the electron to 2E, the incident wavelength must be:

14. When the metallic surface is illuminated with monochromatic light of wavelength λ, the stopping potential is 5 V₀. When the same surface is illuminated with the light of wavelength 3λ, the stopping potential is V₀. Then the work function of the metallic surface is:


15. The light ray having photons of energy 1.8 eV are falling on a metal surface having a work function 1.2 eV. What is the stopping potential to be applied to stop the emitting electrons:

                                                 
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