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Class 12 Physics (Part Ii) Chapter 11 Dual Nature Of Radiation And Matter Quiz 1 (25 MCQs)

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1. The momentum of photon of energy 1 MeV in kgms$^{-1}$ will be
2. The slope of the stopping potential vs frequency graph:
3. WHICH of the following has minimum stopping potential/
4. According to the de Broglie hypothesis, which of the following statements is applicable to thewavelength of a moving particle?
5. A light of wavelength 5000 A$^{0}$ falls on a photosensitive plate with photoelectric work function 1.90 eV. Kinetic energy of the emitted photo-electrons will be (h=6.62 x 10$^{-34}$ Js)
6. Observation:Bright blue light liberates photoelectrons fromthe surface of lithium but red light from thesame intensity does not give off any electronsat all.Explanation:Photons of blue light carry more energy thanphotons of red light because the frequency ofblue light is higher than the frequency of redlightDOES THE EXPLANATION EXPLAIN THE OBSERVATION?
7. Two photons, each of energy 2.5 eV are simultaneously incident on sodium metal surface the work function of sodium is 2.75 eV, then from its surface ..... will be emitted.
8. In discharge tube, ionization of enclosed gas is produced due to collision between
9. TWO particles have equal momentum. what is the ratio of their de Broglie wavelength?
10. The saturation current is proportional to the ..... of radiation
11. Photoelectric emission is a/an ..... process.
12. What is the significance of the Davisson-Germer experiment in understanding the nature of matter?
13. What is the phenomenon where electrons are emitted from a material when it is exposed to light?
14. Light of frequency 1.9 times the threshold frequency is incident on photo-sensitive material. If the frequency ishalved, and intensity is doubled, the photoelectric current becomes
15. A photocell employs photoelectric effect to convert
16. The photo current in an experiment on photoelectric effect increases if
17. An electron is moving with an initial velocity v=v$_{0}$ i and is in a magnetic field B=B$_{0}$j. Then its de Broglie wavelength
18. The stopping potential depends upon the ..... of the fastest electron.
19. The minimum required frequency required to remove an electron from an atom is called:
20. The energy spent in releasing a photoelectron is called photoelectric ..... of the metal
21. Threshold frequency of potassium is 3 x 10$^{14}$ Hz. The work function is
22. According to the quantum theory, light is emitted in the form discrete bundles of energy called .....
23. If in a photoelectric experiment the wavelength of incident radiation is reduced from 6000 A$^{0}$ to 4000 A$^{0}$ then
24. The value of stopping potential when the frequency of light is equal to the threshold frequency is
25. The work function value of molybdenum is
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