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Class 12 Physics (Part Ii) Chapter 11 Dual Nature Of Radiation And Matter Quiz 2 (25 MCQs)

Quiz Instructions

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1. Hallwachs experiment set-up is used to study:
2. A photosensitive surface emits photoelectrons when red light falls on it. Will the surface emit photoelectrons when blue light is incident on it?
3. The emission of electron is possible by
4. Light exhibits ..... duality
5. Photoelectric current is ..... proportional to the number of photoelectrons emitted per second.
6. Which of the following has highest specific charge?
7. A beam of cathode rays is subjected to crossed electric and magnetic fields. The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by
8. The cathode is coated with a material of low work function because
9. The photon behaves as a particle in ..... phenomenon
10. The magnitude of saturation photoelectric current depends upon
11. The speed of the fastest photoelectron emitted from a surface of threshold wavelength 600 nm, when the surface isirradiated by light of wavelength 400 nm is
12. The photoelectric threshold frequency of a metal is 'v'. When light of frequency '4v' is incident on the metal, the maximum kinetic energy of the emitted photo electrons is
13. When the intensity of a light source is increased
14. Two metals A and B have work functions of 2 eV and 5 V respectively. When light of wavelength 400 nm is incident, electrons are emitted from
15. In the photoelectric effect, if the intensity of incident light increases, the
16. If the kinetic energy of photo electron is found to be 16 J, whose mass is $m_e$
17. Velocity of photo is proportional to in terms of frequency 'v' will be
18. Heisenberg's Uncertainty Formula is .....
19. A proton, a neutron, an electron and an alpha particle have same energy Then their de Broglie wavelengths compare as
20. Two light rays having photon of energy 1.8 eV are falling on metal surface having work function 1.2 eV . The stopping potential applied to stop emitting photo electrons will be
21. For a given frequency of the incident radiation, the stopping potential ..... of its intensity.
22. A particle is dropped from a height H. The de Broglie wavelength of the particle as a function of height is proportional to
23. Which is the correct form of Einstein's photoelectric equation?
24. In various experiments on photo electricity dealing with the stopping potential dependence on frequency of incident radiation the conclusion was that stopping potential
25. What is the threshold frequency in the context of the photoelectric effect?
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