Briefly explain how we can use spectral lines to determine an object's rotation rate
What will be an ideal response?
Lines are wider for faster-rotating objects because parts of the object are rotating toward us and parts are rotating away from us.
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A fermion has integral spin
Indicate whether the statement is true or false
An electron microscope makes use of
A) short wavelengths of light. B) the wave nature of electrons. C) electron attraction and repulsion. D) electron current. E) the inertia of electrons.
Fusion reactors like the Tokomak shown here would be an ideal source of energy that do not suffer from the disadvantages of fission reactors. Why is nuclear fission much more practical as an energy source than nuclear fusion?
a. Because radioactive nuclei are available as a fuel for fission, but no fuel for nuclear fusion is available. b. A chain reaction drives nuclear fission, but sustaining nuclear fusion is much more difficult. c. Nuclear fusion has never been demonstrated. d. The lower atomic masses of the fusion fuels limit their energy output. e. The high temperatures needed for fusion make fusion reactors far too dangerous.
The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field during this process?
A) It decreases. B) It increases. C) It remains constant. D) There is no way to tell from the information given.