If the handle of a tuning fork is held solidly against a table, its resulting sound is
1) louder,
2) softer,
3) doesn't change,
and as a result of this, the length of time the fork keeps vibrating
4) increases.
5) decreases.
6) doesn't change.
Answer: 1, 5
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A beam of X-rays of different frequencies is reflected at 10 degrees off a crystal of interatomic spacing 0.2 nm. Which X-ray wavelength is preferentially reflected?
a. 0.0943 nm b. 0.139 nm c. 0.069 5 nm d. 1.02 × 10^-10 m e. 3.47 × 10^-11 m
In a semiconductor doped with donor atoms, the conduction-band energy is 1.1 eV and the donor energy level is 1.0 eV. At a high temperature there are approximately as many electrons in the conduction band as there are holes in the valence band. For this semiconductor, the Fermi energy is approximately equal to:
(a) 1.1 eV (b) 1.0 eV (c) 1.05 eV (d) 0.55 eV
Nuclear Fission and Fusion: The main fuel for producing energy in the center of the sun is
A. helium. B. hydrogen. C. uranium. D. any radioactive material. E. oxygen.
The index of refraction, n, of a material is a measure of how the speed of light changes. What can be said about the speed of light in a material with n=1.5 compared to a material with n=1.7?
A. It is the same for both. B. It is slower in the n=1.7 material. C. It is slower in the n=1.5 material. D. It depends on the wavelength of the light.