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Class 12 Physics (Part Ii) Chapter 11 Dual Nature Of Radiation And Matter Quiz 4 (25 MCQs)

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1. If 5% of the energy supplied to a bulb is radiated as visible light, the number of photons of visible light emitted persecond by a 100 W bulb is (assume wavelength of the visible light to be 5.6 x 10$^{-5}$ cm)
2. The phenomenon by which metals emit electrons under the influence of radiation is called .....
3. The stopping voltage in photoelectric effet depends
4. The maximum kinetic energy of the photoelectrons is ..... proportional to the frequency of incident radiation.
5. Two metals A, B have work functions 2 eV and 4 eV respectively. Which metal has lower threshold wavelength for photoelectric effect?
6. As the intensity increases .....
7. Observation:Bright blue light liberates photoelectrons from the surface of lithium but red light from the same intensity does not give off any electrons at all.Explanation:The intensity of red light is not sufficient to liberate photoelectrons DOES THE EXPLANATION EXPLAIN THE OBSERVATION?
8. The rest mass of photon is
9. An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is:
10. In photo electric effect, the K.E of electrons emitted from the metal surface depends upon
11. The light photon has ..... nature
12. Who proposed the wave-particle duality theory?
13. The work function of a metal surface is 4.14eV. The cut off wavelength of this metal is
14. The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential is
15. The alphabet "h" represent ..... constant
16. The critical or threshold wavelength for a photosensitive surface is 6000 Angstrom and the wavelength of the incident light is5000 Angstrom. Then the maximum energy of the emitted electrons would be
17. The frequency of the incident radiation below which the photo electric emission is not possible completely is known as ..... frequency
18. A 200 W sodium street lamp emits yellow light. The number of photons of yellow light it emits per second is:
19. The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate, light source is put on and a saturation photoelectric current is recorded. An electric field is switched on which has a vertically downward direction
20. Below the threshold frequency, if the intensity of radiation is increased, the emission of photoelectrons .....
21. The slope of frequency of incident ray and stopping potential for a given surface
22. For photo electric emission, tungsten requires light of 2300A$^{0}$. If light of 1800 A0wavelength is incident, then emission
23. Who discovered Photoelectric Effect?
24. Photoelectric does not occur when a metal plate is exposed to ultra-violet rays. It will occur if the plate is exposed to
25. An electron and proton possessing same amount of kinetic energies. The de-Broglie wavelength is greater for
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