A fixed amount of an ideal monatomic gas is maintained at constant volume as it is cooled by 50 K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done on the gas during this process?
A) 0 J
B) 400 J
C) -400 J
D) -200 J
E) 200 J
A
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The Fermi energy of a metal at a temperature T is 7.0 eV. What is the average energy (in eV) of a conduction electron at that temperature?
a. 2.8 b. 7.0 c. 3.5 d. 4.2 e. 4.7
This photograph shows an interstellar bubble about 10 light-years in diameter. If you could photograph this same region about 100 years from now, how would you expect it to look different?
A) The bubble will be slightly larger. B) The bubble will be slightly smaller. C) The bubble will have burst as a supernova. D) The bubble's shape will have become much more like an oval rather than a sphere.
Three resistors, 10 ?, 20 ?, and 30 ?, are wired in series and connected to a 120-V battery. How much current flows in the circuit?
A far-sighted student has a near point of 1.0 m. Calculate the focal length (in cm) of the glasses needed so the near point will be normal (25 cm).
A. 72 B. 25 C. 33 D. 100 E. ?33