If the wavelength of a photon is doubled, what happens to its energy?
A) It is reduced to one-half of its original value.
B) It stays the same.
C) It is doubled.
D) It is increased to four times its original value.
E) It is reduced to one-fourth of its original value.
A
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In cathodic protection of a metal structure, the structure is connected to the _________terminal of a battery.
Fill in the blank(s) with the appropriate word(s).
The hot gas of the big bang seems to be cool at about 2.7 K because:
A) the expansion of the Universe has decreased the wavelengths of the radiation emitted by the big bang. B) the gas clouds that emitted the photons during the big bang had a temperature of 2.7 K. C) the expansion of the Universe has redshifted the wavelengths of the radiation emitted by the big bang about 1100 times longer. D) the gas clouds that emitted the photons during the big bang emitted blackbody radiation with a wavelength of 2.7 nm.
During a thermodynamic process, the entropy of a certain system decreases by 1.0 J/K. What are some possible entropy changes that could have occurred within the system's surrounding environment?
1.Its entropy could have also decreased by 1.0 J/K. 2.Its entropy could have remained constant. 3.Its entropy could have increased by 2.5 J/K. 4.All of these could have occurred.
Charge in an Electric Field: A small styrofoam ball of mass 0.120 g is placed in an electric field of 6000 N/C pointing downward. What excess charge must be placed on the ball for it to remain suspended in the field?
A. -16.0 nC B. -18.0 nC C. -57.2 nC D. -125 nC E. -196 nC