Suppose we have a quantum system of an unknown type. We find that a certain amount of energy ?E moves this system from its lowest possible energy to its second-lowest energy, but 
?E is required to get it to its next higher energy. Is this quantum system a quanton in a box, a hydrogen atom, or a simple harmonic oscillator?
A. A quanton in a box.
B. A hydrogen atom.
C. A simple harmonic oscillator.
D. The stated facts are inconsistent with all of these models.
A. A quanton in a box.
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star Arcturus is a red giant that is easily visible in the night sky. Based on models of stellar evolution, what is happening to Arcturus as this stage of its life?
A) It is increasing in size, and hydrogen fusion reactions are occurring in a shell around the core. B) It is stable in its size, and hydrogen fusion reactions are occurring in its core. C) It is decreasing in size, and hydrogen fusion reactions are occurring in its core. D) It is increasing in size, and hydrogen fusion reactions are occurring in its core. E) It is decreasing in size, and hydrogen fusion reactions are occurring in a shell around the core. F) It is stable in its size, and hydrogen fusion reactions are occurring in a shell around the core.
What circumstances produce stationary patterns in interfering waves?
a. The waves have to be stationary (i.e., not move). b. The waves have to have the same amplitude. c. The waves need to have the same wavelength but different frequencies. d. The waves have to have the same wavelength and a constant phase difference. e. The waves have to have the same wavelength and varying phase differences.
A light ray is incident on the surface of water (n = 1.33) at an angle of 60° relative to the normal to the surface. The angle of the reflected wave is
a. 80° b. 40° c. 20° d. 60° e. 30°
A scalar quantity is described by both a magnitude and a direction
Indicate whether the statement is true or false