JEE PHYSICS UNIT 17
QUIZ NO 2
TOTAL QUESTIONS = 20


1. When UV light of wavelength 300 nm is incident on a metal surface having work function 2.13 eV, electron emission takes place. The maximum kinetic energy of the emitted electrons is approximately:


2. A proton and an electron have the same de Broglie wavelength. If Kp and Ke be their kinetic energies respectively, then:


3. Which of the following phenomena is not explained by the wave nature of light?


4. In a photoelectric experiment, energy of 2.48 eV irradiates a photosensitive material. The stopping potential was measured to be 0.5 V. The work function of the material is:


5. The de Broglie wavelength of an electron is the same as that of a photon. If the velocity of the electron is 25% of the velocity of light, then the ratio of energy of the photon to that of the electron is:


6. When a metal surface is illuminated by light of wavelength λ, the stopping potential is 8 V. When the same surface is illuminated by light of wavelength 2λ, the stopping potential is 4 V. The threshold wavelength for the metal surface is:


7. The work function of a substance is 3.0 eV. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:


8. A proton and an α-particle are accelerated from rest by a potential difference of 100 V. After this, their de Broglie wavelengths are related by:


9. The threshold frequency of a metal with work function 6.63 eV is:


10. A proton moving with one-tenth of the velocity of light has a certain de Broglie wavelength λ. An alpha particle having the same de Broglie wavelength λ will have a velocity of:


11. In a photoelectric effect experiment, a light of frequency 1.5 times the threshold frequency is made to fall on the surface of a photosensitive material. If the frequency is halved and the intensity is doubled, the photoelectric current becomes:


12. The de Broglie wavelength of a molecule in a gas at room temperature (300 K) is λ₁. If the temperature of the gas is increased to 600 K, the de Broglie wavelength becomes:


13. In a photoelectric experiment, the stopping potential is V₀. If the frequency of the incident light is doubled, the stopping potential becomes approximately:


14. The ratio of the de Broglie wavelengths of a proton and an electron having the same kinetic energy is approximately:


15. A metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V₀. If the same surface is illuminated with radiation of wavelength λ/2, the stopping potential will be:


16. The work functions of Aluminium and Gold are 4.1 eV and 5.1 eV respectively. The ratio of the slopes of the stopping potential versus frequency plot for Aluminium to Gold is:


17. An electron accelerated through a potential difference V₁ has a de Broglie wavelength λ. When the potential is changed to V₂, its de Broglie wavelength becomes 2λ. The ratio V₁/V₂ is:


18. The kinetic energy of an electron, α-particle, and a proton are given as 4K, 2K, and K respectively. The ratio of their de Broglie wavelengths is:


19. A proton and an electron are associated with the same de Broglie wavelength. The ratio of their kinetic energies is:


20. The de Broglie wavelength of an electron having kinetic energy E is λ. If the kinetic energy of the electron becomes E/4, the de Broglie wavelength becomes:



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