Physics 101, 4rth 2Xs quiz MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Sort # 15275, Form ID AA 04,

  1. Which of the following cannot travel in a vacuum? A) a light wave B) a sound wave C) a radio wave D) All can travel in a vacuum. E) None can travel in a vacuum.
  2. Things seen by moonlight usually aren't colored because moonlight A) doesn't have very many colors in it. B) is too dim to activate the retina's cones. C) photons don't have enough energy to activate the retina's cones. D) all of these. E) none of these.
  3. The law of reflection holds for A) plane mirrors. B) curved mirrors. C) both of these. D) neither of these.
  4. A sheet of red paper will look black when illuminated with A) red light. B) yellow light. C) magenta light. D) cyan light. E) none of these.
  5. A diver shines light up to the surface of a smooth pond at a 10 degree angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of A) less than 10 degrees. B) 10 degrees. C) more than 10 degrees.
  6. Light refracts when traveling from air into glass because light A) has greater intensity in air than in glass. B) has greater intensity in glass than in air. C) has greater frequency in air than in glass. D) has greater frequency in glass than in air. E) travels slower in glass than in air.
  7. Waves diffract the most when their wavelength is A) short. B) long. C) both diffract the same.
  8. Polarization is a property of A) transverse waves. B) longitudinal waves. C) both. D) neither.
  9. Interference colors in a soap bubble give evidence that the soap film A) has two reflecting surfaces. B) is thin. C) both of these. D) neither of these.
  10. An atom that absorbs a photon of a certain energy can then emit A) only a photon of that energy. B) a photon of any energy. C) only a photon of the same or higher energy. D) only a photon of the same or lower energy.
  11. The energy of a photon is related to A) the energy given to the atom that emits it. B) the energy level difference though which it falls. C) its frequency. D) all of these. E) none of these.
  12. According to the uncertainty principle, the more we know about a particle's momentum, the less we know about its A) kinetic energy. B) mass C) speed. D) location. E) none of these.
  13. Which of the following is not quantized? A) energy B) radiation C) number of people in a room D) electric charge E) All are quantized.
  14. When a clean surface of potassium metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following will also increase? A) the number of electrons ejected per second B) the maximum kinetic energy of the ejected electrons C) the threshold frequency of the ejected electrons D) the time lag between the absorption of blue light and the start of emission of the electrons E) none of these
  15. Which of the following forms an interference pattern when directed toward two suitably-spaced slits? A) light B) sound C) electrons D) all of these E) none of these
  16. Most alpha particles fired at a gold foil pass through undeflected because the A) electric field is zero inside the gold. B) gold atoms, unlike most other metal atoms, are relatively far apart. C) atoms of gold, like any others, are mostly empty space. D) net charge of the gold atoms is zero. E) none of these.
  17. When a nucleus emits a beta particle, its atomic number A) remains constant, but its mass number changes. B) remains constant, and so does its mass number. C) changes, but its mass number remains constant. D) changes, and so does its mass number. E) none of these.
  18. When the hydrogen isotope tritium-3 emits a beta particle, it becomes an isotope of A) hydrogen. B) helium. C) lithium. D) carbon. E) none of these.
  19. The half life of carbon 14 is 5730 years. If a 1-gram sample of old carbon is 1/8 as radioactive as 1-gram of a current sample, then the age of the old sample is about A) 716 years. B) 11,500 years. C) 17,200 years. D) 22,900 years. E) 46,000 years.
  20. A paint pigment that absorbs red light and gives off blue light: A) is fluorescent. B) is phosphorescent. C) is used in lasers. D) is polarized. E) doesn't exist.