Chap 37 Flashcards
Which of the following statements is true regarding how blackbody radiation changes as the temperature of the radiating object increases?
A. Both the maximum intensity and the peak wavelength increase.
B. The maximum intensity increases, and the peak wavelength decreases.
C. Both the maximum intensity and the peak wavelength decrease.
D. The maximum intensity decreases, and the peak wavelength increases.
B
A beam of red light and a beam of blue light have equal intensities. Which statement is true?
A. There are more photons in the blue beam.
B. There are more photons in the red beam.
C. Both beams contain the same number of photons.
D. The number of photons is not related to intensity.
B
Which of the following is necessarily true?
A. Red light has more energy than violet light.
B. Violet light has more energy than red light.
C. A single photon of red light has more energy than a single photon of violet light.
D. A single photon of violet light has more energy than a single photon of red light.
E. None of the above.
F. A combination of the above (specify).
D
If a photon of energy E ejects electrons from a metal with kinetic energy K, then a photon with energy E / 2
A. will eject electrons with kinetic energy E / 2.
B. will eject electrons with an energy greater than E/ 2.
C. will eject electrons with an energy less than E/2.
D. might not eject any electrons.
D
Monochromatic light is incident on a metal surface, and electrons are ejected. If the intensity of that light increases, what will happen to the maximum energy of the electrons?
A. The maximum energy will increase.
B. The maximum energy will decrease.
C. The maximum energy will remain the same.
D. Changes in the maximum energy cannot be determined without additional information.
C
Monochromatic light is incident on a metal surface, but no photoelectrons are emitted. If electrons are to be ejected from the surface, how should the incident light be adjusted?
A. Light of a shorter wavelength should be used.
B. The intensity of the light should be increased.
C. Light of a longer wavelength should be used.
D. The intensity of the light should be decreased.
A
If the momentum of an electron is doubled, how would its wavelength change?
A. No change.
B. It would be halved.
C. It would double.
D. It would be quadrupled.
E. It would be reduced to one-fourth.
B
Which of the following can be thought of as either a wave or a particle?
A. Light.
B. An electron.
C. A proton.
D. All of the above.
D
An electron
A. is a particle.
B. is a wave.
C. is both a particle and a wave.
D. exhibits particle properties, or wave properties, depending on the experiment being performed.
D
When you throw a baseball, its de Broglie wavelength is
A. the same size as the ball.
B. about the same size as an atom (10^-10 m).
C. about the same size as an atom’s nucleus (10^-15 m).
D. much smaller than the size of an atom’s nucleus.
D
Electrons and photons of light are similar in that
A. both have momentum given by h/y.
B. both exhibit wave–particle duality.
C. both are used in diffraction experiments to explore structure.
D. All of the above.
E. None of the above.
D
In Rutherford’s famous set of experiments described in Section 37–9, the fact that some alpha particles were deflected at large angles indicated that
A. the nucleus was positive.
B. charge was quantized.
C. the nucleus was concentrated in a small region of space.
D. most of the atom is empty space.
E. None of the above.
A, C, D
Which of the following is the currently accepted model of the atom?
A. The plum-pudding model.
B. The Rutherford atom.
C. The Bohr atom.
D. None of the above.
D
Which of the following electron transitions between two energy states (n) in the hydrogen atom corresponds to the emission of a photon with the longest wavelength?
A. 2 -> 5
B. 5 -> 2
C. 5 -> 8
D. 8 -> 5
D
If we set the potential energy of an electron and a proton to be zero when they are an infinite distance apart, then the lowest energy a bound electron in a hydrogen atom can have is
A. 0.
B. -13.6 eV.
C. any possible value.
D. any value between -13.6 eV and 0.
B
