An ideal gas is allowed to expand adiabatically. Assume the process is reversible. The change in entropy is
a. 0
b. nR ln (V2/V1)
c. nR ln (T2/T1)
d. kn ln (V2/V1)
e. kn ln (T2/T1)
a
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Light from an incandescent wire disperses into a(n) ______________ spectrum
Fill in the blank(s) with correct word
A double loop of wire (making 2 turns) is in the x-y plane centered at the origin. A uniform magnetic field is increasing at a constant rate in the negative z direction. In which direction is the induced magnetic field in the loop?
a. There is no induced field because of the double loop. b. There is no induced field because the rate of change of the magnetic field is constant. c. in the negative z direction d. in the positive z direction
Are cosmic rays a form of light?
A) No, they consist of high-energy subatomic particles, not of electromagnetic waves. B) Yes, they are light waves with higher energy than gamma rays. C) Yes, they are light waves with lower energy than radio waves. D) Yes, they are the name we give to all rays of light that come from the cosmos.
The "flatness" problem arises because the curvature of space seems remarkably close to:
A) zero curvature, favoring a spherical cosmos. B) exactly one. C) .5, suggesting we are split between open and closed universes. D) 2.73 K, in spite of the eddies and turbulence that led to galaxy formation. E) infinity, suggesting an open universe is the only possible cosmology.