The wavelength of a traveling wave can be calculated if one knows the:
a. frequency.
b. speed and amplitude.
c. amplitude and frequency.
d. frequency and speed.
d
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The main reason for positioning many radio telescopes across a large area and combining the signals is
a. to observe more objects in a shorter amount of time. b. provide a backup system if one or more of the telescopes go down. c. to produce higher resolution images. d. to avoid interference between signals from the separate telescopes. e. to account for the motion of objects in the sky as a result of the Earth's rotation.
The natural frequencies for a stretched string of length L, and wave speed v, are Nv/(2L) where N equals
A) 0, 1, 2, 3, ... B) 2, 4, 6, 8, ... C) 1, 2, 3, 4, ... D) 0, 1, 3, 5, ... E) 1, 3, 4, 5, ...
Werner Heisenberg's main contribution to the development of quantum theory was
A) the nonlocality principle. B) his explanation of the photoelectric effect, in terms of photons. C) a method for predicting the position at which electrons or other particles will strike the viewing screen in such experiments as the electron double-slit experiment. D) a method for predicting the overall statistical patterns that appear in the electron double-slit experiment and other experiments using microscopic particles. E) the uncertainty principle.
If a product requires a high elastic modulus, which class of materials can be eliminated from consideration?
(a) Metals (b) Polymers (c) Ceramics (d) Composites