Planck's quantum theory is compatible with the experimental data related to which of the following?

1. Planck's quantum theory is compatible with the experimental data related to which of the following? • blackbody radiation • the photoelectric effect. • line spectra emitted by hydrogen gas • all of the choices

2. Blue light will not eject electrons from a certain metal; however, which one of the following may possibly eject electrons from that metal? • infra-red • ultra-violet • red • green

3. What is the energy associated with a light quantum of wavelength 5.0 x 10-7 m? (h = 6.63 x 10-34 J-s) • 4.0 x 10-19 J • 3.3 x 10-19 J • 1.5 x 10-19 J • 1.7 x 10-19 J

4. If a monochromatic light beam with quantum energy value of 3.0 eV incident upon a photocell where the work function of the target metal is 1.60 eV, what is the maximum kinetic energy of ejected electrons? • 4.6 eV • 4.8 eV • 1.4 eV • 2.4 eV

5. Which of the following devices represent(s) a practical application of the photoelectric effect? • hologram • camera light intensity meter • both of the choices • none of the choices

6. X-ray production occurs in which process? • photons hitting a metal, emitting electrons • electrons hitting a metal, emitting photons • photons hitting a metal, emitting X-rays • electrons hitting a metal and scattering elasticly

7. Which of the following devices represent(s) a practical application of the photoelectric effect? • hologram • camera light intensity meter • both of the choices • none of the choices

8. An important use of X-ray diffraction was? • the observation of Compton scattering. • determining the structure of the DNA molecule. • production of positrons. • observation of the photoelectric effect.

9. Which process cannot occur if only one photon is involved? • pair annihilation • pair production • the photoelectric effect • X-ray production

10. According to the principle of complementarity, everything acts in a given experiment as if it is either a wave or a particle. In which experiment is the wave aspect exhibited? • the Davisson and Germer experiment • the photoelectric effect • pair production • Compton scattering

11. The spacing between atoms in KCl crystal is 3.1 x 10-10 m. At what angle from the surface will a beam of 3.14 x 10-11 m X-rays be constructively scattered? • 57 ° • 2.3 ° • 90 ° • 10 °

12. The "seeing" ability or resolution of radiation is determined by its wavelength. If the size of an atom is approximately 10-10 m, how fast must an electron travel to have a wavelength smaller than that of an atom? (me = 9.1 x 10-31 kg, h = 6.626 x 10-34 J-s) • 7.28 x 106 m/s • 3.39 x 106 m/s • 1.03 x 106 m/s • 5.35 x 105 m/s

13. The ultraviolet catastrophe predicts that? • all objects should radiate extreme amounts of ultraviolet light. • as an object gets hotter its light will change from dull red to blue white. • a black body can absorb an infinite amount of radiation if the radiation is in the ultraviolet region. • the radiated energy approaches zero as the wavelength approaches zero.

14. According to Einstein, increasing the brightness of a beam of light without changing its color will increase? • the number of photons. • the energy of each photon. • the speed of the photons. • the frequency of the photons.

15. Classical theories predict that most of the energy from a black body should be radiated? • as thermal radiation in the infrared region. • at the wavelength given by Wien's displacement law. • as ultraviolet light. • a black body should not radiate.

16. If a photon is absorbed by an electron, it will give up more energy to that electron if the photon? • is not spread out over many electrons. • is moving faster. • is moving slower. • has a higher frequency.

17. If an electron has a measured wavelength of 0.85 x 10-10 m, what is its kinetic energy? (h = 6.63 x 10-34 J-s, 1 eV = 1.6 x 10-19 J, and me = 9.11 x 10-31 kg) • 55 eV • 104 eV • 147 eV • 209 eV

18. A sodium vapor lamp has a power output of 300 W. If 590 nm is the average wavelength of the source, about how many photons are emitted per second? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s and 1 nm = 10-9 m) • 1017 • 1021 • 1025

19. Consider a hollow body with a small hole in one side. If this is a black body, it must? • be filled with gas. • emit no light. • have black paint on the walls. • contain electromagnetic radiation.

20. What is the de Broglie wavelength of an electron accelerated from rest through a potential difference of 50 V? (h = 6.63 x 10-34 J-s, me = 9.11 x 10-31 kg and 1 eV = 1.67 x 10-19 J) • 1.04 x 10-10 m • 1.39 x 10-10 m • 1.74 x 10-10 m • 8.34 x 10-10 m

21. X-rays of wavelength of 0.0650 nm undergo Compton scattering from free electrons in carbon. What is the wavelength of photons scattered at 90° relative to the incident beam? (h = 6.63 x 10-34 J-s, me = 9.11 x 10-31 kg, c = 3 x 108 m/s and 1 nm = 10-9 m) • 0.0024 nm • 0.0674 nm • 0.0687 nm • 0.0626 nm

22. In regard to the Compton scattering experiment with X-rays incident upon a carbon block, as the scattering angle becomes larger, what happens to the magnitude of difference between the incident and scattered wavelengths? • increases • decreases • remains constant • difference is maximum at 45° angle of scatter

23. Which of the following statements best describes the relation between the quantum theory and the photoelectric effect experiment? • quantum theory explains photoelectric effect • photoelectric effect contradicts quantum theory • quantum theory has no bearing on photoelectric effect • photoelectric effect explains quantum theory

24. The sun's surface temperature is 5800 K and the peak wavelength in its radiation is 500 nm. What is the surface temperature of a distant star where the peak wavelength is 475 nm? • 5510 K • 5626 K • 6105 K • 6350 K

25. Light of wavelength 480 nm is incident on a metallic surface with a resultant photoelectric stopping potential of 0.55 V. What is the work function of the metal? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J and 1 nm = 10-9 m) • 2.04 eV • 3.19 eV • 2.59 eV • 0.55 eV

26. If the minimum X-ray wavelength produced is 13.5 x 10-12 m, through what potential are the electrons accelerated in order to generate this radiation? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s and 1 eV = 1.6 x 10-19 J) • 33,000 V • 46,040 V • 75,000 V • 92,080 V

27. According to Wien's displacement law, if the absolute temperature of a radiating blackbody is tripled, then the peak wavelength emitted will change by what factor? • 1/3 • 1.0 • 3.0 • 9.0

28. Blue light (λ = 460 nm) is incident on a piece of potassium (Ø = 2.2 eV). What is the maximum kinetic energy of the ejected photoelectrons? (h = 6.626 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J) • 1.0 eV • 0.5 eV • 0.25 eV • 4.9 eV

29. What is the energy of a photon whose frequency is 6 x 1020 Hz? (h = 6.63 x 10-34 J-s and 1 eV = 1.6 x 10-19 J) • 1.6 MeV • 2.5 MeV • 3.3 MeV • 4.8 MeV

30. A quantum of radiation has an energy of 2 keV. What is its frequency? (h = 6.63 x 10-34 J-s and 1 eV = 1.6 x 10-19 J) • 3.2 x 1017 Hz • 4.8 x 1017 Hz • 6.3 x 1017 Hz • 7.3 x 1017 Hz

31. If a quantum of radiation has an energy of 2 keV, what is its wavelength? (h = 6.63 x 10-34 J-s, 1 eV = 1.6 x 10-19 J, c = 3 x 108 m/s and 1 nm = 10-9 m) • 0.32 nm • 0.41 nm • 0.62 nm • 1.02 nm

32. An ultraviolet light beam having a wavelength of 130 nm is incident on a molybdenum surface with work function of 4.2 eV. What is the stopping potential? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J and 1 nm = 10-9 m) • 1.3 V • 3.5 V • 5.4 V • 11.9 V

33. The Compton experiment demonstrated which of the following when an X-ray photon collides with an electron? • momentum is conserved • energy is conserved • momentum and energy are both conserved • wavelength of scattered photon equals that of incident photon

34. An electron and a positron both of rest mass 0.57 MeV slowly drift together and annihilate into two gamma ray photons. What is the wavelength of each of the photons? • 1.21 x 10-12 m • 2.43 x 10-12 m • 4.86 x 10-12 m • 9.72 x 10-12 m

35. A proton (mass = 1.67 x 10-27 kg) has a kinetic energy of 1 MeV. If its momentum is measured with an uncertainty of 1%, what is the minimum uncertainty in its position? (h = 6.626 x 10-34 J-s) • 9.08 x 10-13 m • 2.28 x 10-13 m • 9.08 x 10-14 m • 5.64 x 10-14 m

36. An electron microscope operates with electrons of kinetic energy 40 keV. What is the wavelength of these electrons? (h = 6.626 x 10-34 J-s, 1 eV = 1.6 x 10-19 J, and me = 9.1 x 10-31 kg) • 0.50 x 10-10 m • 7.17 x 10-11 m • 6.14 x 10-12 m • 3.07 x 10-13 m

37. How much energy (in eV) does a photon of red light ( λ = 640 nm) have? (h = 6.626 x 10-34 J-s and 1 eV = 1.6 x 10-19 J) • 3.2 eV • 2.5 eV • 1.9 eV • 1.3 eV

38. In an X-ray diffraction experiment, using X-rays of wavelength λ = 0.5 x 10-10 m, a first-order maximum occurred at 5° off the crystal plane. Find the distance d between crystal planes. • 2.87 x 10-10 m • 1.36 x 10-10 m • 6.24 x 10-9 m • 1.93 x 10-9 m

39. What is the maximum velocity of a photoelectron emitted from a surface with work function 5 eV when illuminated by 200 nm ultraviolet light? (melectron = 9.1 x 10-31 kg, h = 6.626 x 10-34 J-s, 1 eV = 1.6 x 10-19 J) • 800,080 m/s • 652,800 m/s • 431,100 m/s • 212,200 m/s

40. A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 0.5 mW. How many photons are emitted each second? (h = 6.626 x 10-34 J-s) • 1.6 x 1015 • 3.3 x 1016 • 4.8 x 1017 • 2.6 x 1018

41. What speed does a 0.06 kg golf ball have if its de Broglie wavelength is 4.28 x 10-34 m? • 15 m/s • 26 m/s • 31 m/s • 48 m/s

42. The electron microscope's main advantage over the optical microscope is which of the following? • greater ease of portability • dispenses with need for a lens • higher power lens used • higher resolution possible

43. The wave function as derived in Schrodinger's equation is best described as being a measure of which of the following? • photon beam frequency • photon wavelength • particle wavelength • probability

44. What is the de Broglie wavelength for a proton (m = 1.67 x 10-27 kg) moving at a speed of 5.0 x 105 m/s? (h = 6.63 x 10-34 J-s) • 1.1 x 10-12 m • 0.42 x 10-12 m • 1.8 x 10-12 m • 0.79 x 10-12 m

45. What is the minimum X-ray wavelength produced when electrons are accelerated through a potential of 50,000 V? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s and 1 eV = 1.6 x 10-19 J) • 12.4 x 10-12 m • 16.5 x 10-12 m • 19.8 x 10-12 m • 24.9 x 10-12 m

46. A monochromatic light beam is incident on a barium target which has a work function of 2.50 eV. If a stopping potential of 1.0 V is required, what is the light beam wavelength? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J and 1 nm = 10-9 m) • 355 nm • 497 nm • 744 nm • 1421 nm

47. Light of wavelength 450 nm is incident on a target metal which has a work function of 1.8 eV. What stopping potential is required for this combination in a phototube? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J and 1 nm = 10-9 m) • 0.57 V • 0.96 V • 2.76 V • 4.56 V

48. If barium has a work function of 2.60 eV, what is its cutoff wavelength when used as a phototube target? (h = 6.63 x 10-34 J-s, c = 3 x 108 m/s, 1 eV = 1.6 x 10-19 J and 1 nm = 10-9 m) • 398 nm • 477 nm • 497 nm • 596 nm

49. A monochromatic light beam is incident on a barium target, which has a work function of 2.50 eV. If a stopping potential of 1.0 V is required, what is the light beam photon energy? • 1.0 eV • 1.5 eV • 2.5 eV • 3.5 eV

50. According to Heisenberg, as the uncertainty in the measurement of a particle's position is reduced by a factor of 3, by what factor is the uncertainty in that same particle's momentum changed? • 1/3 • 1.0 • 3.0 • 9.0