What does increasing the tension of a guitar string do?
a. Decrease the speed and decrease the frequency of the fundamental.
b. Decrease the speed and increase the wavelength of the fundamental.
c. Decrease the speed and increase the frequency of the fundamental.
d. Increase the speed and decrease the frequency of the fundamental.
e. Increase the speed and increase the frequency of the fundamental.
e
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What fraction of the Galaxy's mass is in a form that does not emit electromagnetic radiation?
A. about 90% B. about 10% C. about 50% D. Zero percent; all of the Galaxy emits some form of light.
Accelerated electron beams are often used to study surfaces and other features of materials. Suppose one had an electron accelerator that was useful for producing electron beams used to study the features of atoms on the surfaces of solids, but wanted to alter the design to produce beams appropriate for the study of the nuclei of those atoms. What would be the appropriate alteration?
A. Increase the beam intensity B. Decrease the beam energy C. Decrease the beam intensity D. Increase the beam energy E. Increase the transverse beam size F. Decrease the transverse beam size
In Figure 9.1, the time t, when P returns to the original position on the x-axis, is closest to:
A) 13 s B) 18 s C) 25 s D) 35 s E) 50 s
The Fermi temperature of copper is 80 000 K. The corresponding Fermi energy (in eV) is
a. 7 b. 5 c. 3 d. 1 e. 4