SHM & Waves MC Questions

2. Which color of light emitted from an atom would be associated with the greatest change in energy of the atom? a. Blue b. Green c. Red d. Violet e. Yellow Questions 8-9 relate to photoelectric effect and the five graphs below.
SHM & Waves Multiple Choice
Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions. Select the one that is best in each case and then blacken the corresponding space on the answer sheet. 1. A cord of fixed length and uniform density, when held between two fixed points under tension T, vibrates with a fundamental frequency f. If the tension is doubled, the fundamental frequency is a. 2f b. √ c. f f d. f 2 e.
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14. Of the following phenomena, which provides the best evidence that particles can have wave properties? a. The absorption of photons by electrons in an atom b. The a-decay of radioactive nuclei c. The interference pattern produced by neutrons incident on a crystal d. The production of x-rays by electrons striking a metal target e. The scattering of photons by electrons at rest
Questions 15-16
17. A particle oscillates up and down in simple harmonic motion. Its height y as a function of time t is shown in the diagram above. At what time t does the particle achieve its maximum positive acceleration? a. 1s b. 2s c. 3s d. 4s e. None of the above, because the acceleration is constant 18. A radar operates at a wavelength of 3 centimeters. The frequency of these waves is a. 10-10 Hz b. 106 Hz c. 108 Hz d. 3 x 108 Hz e. 1010 Hz 19. In the photoelectric effect, the maximum speed of the electrons emitted by a metal surface when it is illuminated by light depends on which of the following? I. Intensity of the light II. Frequency of the light III. Nature of the photoelectric surface a. I only b. III only c. I and II only d. II and III only e. I, II, and III only 20. Atoms of isotopes of the same element contain the same number of a. protons but a different number of neutrons b. electrons but a different number of protons c. neutrons but a different number of protons d. neutrons as electrons e. protons as neutrons
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4. Which graph best shows the maximum kinetic energy K of the photoelectrons as a function of the intensity of incident light? E 5. A vibrating tuning fork sends sound waves into the air surrounding it. During the time in which the tuning fork makes one complete vibration, the emitted wave travels a. one wavelength b. about 340 meters c. a distance directly proportional to the frequency of the vibration d. a distance directly proportional to the square root of the air density e. a distance inversely proportional to the square root of the pressure 6. According to the Bohr model of the atom, electrons orbit the nucleus in definite orbits. According to the laws of classical physics, this model would be impossible because electrons a. the positively charged nucleus attracts the electrons b. Coulomb's law applies c. accelerating electrons radiate energy d. there is a centripetal force on the electrons e. angular momentum is conserved 7. All of the following are properties of x-rays EXCEPT: a. They penetrate light materials. b. They ionize gases. c. They are deflected by magnetic fields. d. They discharge electrified bodies. e. They are diffracted by crystals. 8. Sound in air can best be described as which of the following types of waves? a. Longitudinal b. Transverse c. Torsional d. Electromagnetic e. Pofrared radiation Visible light Ultraviolet radiation Gamma radiation 12. For the five types of electromagnetic radiation listed above, which of the following correctly describes the way in which wavelength, frequency, and photon energy change as one goes from the top of the list to the bottom? Wavelength Frequency Photon Energy a. Decreases Decreases Increases b. Decreases Increases Increases c. Increases Decreases Decreases d. Increases Decreases Increases e. Increases Increases Increases 13. Of the following phenomena, which provides the best evidence that light can have particle properties? a. Interference of light in thin films b. Electromagnetic radiation c. Photoelectric effect d. Electron diffraction e. X-ray diffraction
3. Which graph best shows the maximum kinetic energy K of the photoelectrons as a function of the frequency of incident light? A
11. An object swings on the end of a cord as a simple pendulum with period T. Another object oscillates up and down on the end of a vertical spring, also with period T. If the masses of both objects are doubled, what are the new values for the periods? Pendulum a. 9. The energy level diagram above is for a hypothetical atom. A gas of these atoms initially in the ground state is irradiated with photons having a continuous range of energies between 7 and 10 electron volts, One would expect photons of which of the following energies to be emitted from the gas? a. 1, 2, and 3 eV only b. 4, 5, and 9 eV only c. 1, 3, 5, and 10 eV only d. 1, 5, 3, and 10 eV only e. Since the original photons have a range of energies, one would expect a range of emitted photons with no particular energies 10. Which of the following graphs best represents the de Broglie wavelength of a particle as a function of the linear momentum p of the particle? D b. T c. √ d. √ e. √ Mass on Spring √ √ T T √