Dual Nature of Radiation and Matter Mock Test – Class 12 Physics

1. Photon momentum for radiation of wavelength is given by

2. Which pairing gives the most suitable evidence-aspect connection?

3. Two metals have - lines with the same slope. The threshold frequency of metal is greater than that of metal by . If , the work function of exceeds that of by

4. A particle of mass has kinetic energy and is moving non-relativistically. Its de Broglie wavelength may be written as

5. Classical wave theory expected a low-intensity beam to produce a delayed photoelectric emission because

6. A data table for two above-threshold beams falling on the same metal area is shown below.

The missing photon rates for and are respectively

7. A photoelectric calculation gives after substituting values into . The correct physical interpretation is

8. Two non-relativistic electrons are accelerated from rest through and . The ratio of their de Broglie wavelengths is

9. In a -versus-incident-frequency graph for a photoemissive metal, the slope of the straight line is

10. A claim says, “Matter waves are electromagnetic waves because every wave must be electromagnetic.” The better statement is that matter waves are

11. For an electron accelerated from rest through potential difference , the non-relativistic de Broglie wavelength is

12. Matter waves should not be described as ordinary sound waves because matter waves

13. For photon energy , taking , the momentum is closest to

14. The work function of a metal is . If , the threshold frequency is

15. For one metal, the graph of against frequency gives at and at . The threshold frequency and work function are

16. A statement says, “A higher accelerating voltage always makes electron diffraction easier to observe because the electron wavelength becomes larger.” The suitable correction is that higher voltage

17. Light of wavelength ejects photoelectrons whose maximum speed is . Using , , and , the work function is closest to

18. A threshold-relation record is shown below.

The mismatched row is

19. A photoelectric current is recorded in a circuit connected to an illuminated metal emitter and a collector. The current mainly indicates that

20. For a monochromatic beam falling normally on a fixed metal area, intensity is best connected with photon rate by the relation

21. For photon energy plotted against frequency , consider this graph.

The slope of the graph represents

22. A radiation packet has energy . Express this energy in , using .

23. With in a photoelectric experiment and , the maximum kinetic energy in joules is

24. Study the two cases described below.

What happens to the measured current in the two cases?

25. Comparing a -versus- graph with a -versus- graph for the same metal, the - graph has

26. For a photon of frequency , taking , the energy is

27. In dual-nature physics, the most complete statement among the following is

28. A passage describes four observations:

Which interpretation is the most complete?

29. Light of wavelength falls on a metal. The fastest photoelectrons have de Broglie wavelength . Using and , the work function of the metal is closest to

30. A passage about two metals is given below.

Which statement follows from the passage?

31. A claim says, “Davisson-Germer experiment proves that electrons are waves and not particles.” A more accurate conclusion is that electrons

32. Two metals give straight - graphs. The two lines have the same slope but different frequency-axis intercepts. This happens because

33. If the collector in Lenard’s experiment is made positive with respect to the emitter, the immediate effect on emitted photoelectrons is that they are

34. The statement “any bright light gives current” is not a correct description of a photoelectric cell because

35. For one metal, is plotted against .

The work function of the metal is

36. Which quantity represents the energy gained by a charge when it moves through a potential difference ?

37. Visible light of wavelength is compared with electrons accelerated through . Using , the electron wavelength is smaller than the light wavelength by approximately

38. Davisson and Germer’s experiment is important because it showed

39. Metals , , and have threshold frequencies , , and , respectively. Their work functions are in the ratio

40. A graph-reading note claims, “The - graph and the - graph have the same slope because both come from Einstein’s equation.” The note should be corrected because

41. A comparison of probes used to study small structures is shown below.

The row that should be rejected is

42. If the accelerating potential of an electron beam is increased from to , the de Broglie wavelength becomes

43. A non-relativistic particle has mass and kinetic energy . If its kinetic energy becomes , its de Broglie wavelength becomes

44. From a surface whose threshold wavelength is , a beam produces photoelectrons. If the wavelength is changed to with the same metal, the maximum kinetic energy

45. A claim about the - graph says, “The vertical intercept is positive because stopping potential is always positive.” The best response is that

46. Two intensities are used in a photoelectric experiment with the same frequency above threshold. Intensity is three times . If the saturation current for is , the saturation current for is expected to be

47. The wave nature of a moving cricket ball is not normally observed because its de Broglie wavelength is

48. A photon-energy comparison is shown below.

The missing energies for and are respectively

49. Consider the following statements about the basic photoelectric effect.
Statement I: It is the emission of electrons from a metal surface due to suitable radiation.
Statement II: It can occur even when the incident frequency is below the threshold frequency, provided the intensity is high enough.
Statement III: The emitted electrons are called photoelectrons.

50. A sensor uses a photosensitive emitter of work function . It is illuminated separately by photons of energies , , and . The current can appear for