JEE PHYSICS UNIT 17
QUIZ NO 3
TOTAL QUESTIONS = 20


1. When ultraviolet radiation is incident on a surface, no photoelectrons are emitted. If a second beam causes photoelectrons to be ejected, it may consist of:


2. A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m, the number of electrons emitted is:


3. According to Einstein’s photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is:


4. A photosensitive metallic surface has work function, hv₀. If photons of energy 2 hv₀ fall on this surface, the electrons come out with a maximum velocity of 4 ×10⁶ m/s. When the photon energy is increased to 5 hv₀, then maximum velocity of photoelectrons will be:


5. The work functions for metals A, B, and C are respectively 1.92 eV, 2.0 eV, and 5 eV. According to Einstein's equation, the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are:


6. When photons of energy hv fall on an aluminium plate (of work function E₀), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be:


7. In a discharge tube, ionization of enclosed gas is produced due to collisions between:


8. A photo-cell employs photoelectric effect to convert:


9. The momentum of a photon of energy 1 MeV in kg·m/s will be:


10. Monochromatic light of frequency 6.0 × 10¹⁴ Hz is produced by a laser. The power emitted is 2 × 10⁻³ W. The number of photons emitted, on average, by the source per second is:


11. A 5-watt source emits monochromatic light of wavelength 5000 Å. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of:


12. The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of incident radiation for which the stopping potential is 5 V lies in the:


13. In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of:


14. A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3×10⁶ m/s. The velocity of the particle is:


15. The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (kelvin) and mass m, is proportional to:


16. Electrons of mass m with de-Broglie wavelength λ fall on the target in an X-ray tube. The cutoff wavelength (λ₀) of the emitted X-ray is:


17. Photons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, the maximum energy of emitted photoelectrons will be:


18. An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is:


19. When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is V/4. The threshold wavelength for the metallic surface is:


20. Light of wavelength 500 nm is incident on a metal with work function 2.28 eV. The de Broglie wavelength of the emitted electron is:



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