Find the change in entropy (in J/K) when 5.00 moles of an ideal gas undergo a free expansion from an initial volume of 20 cm3 to a final volume of 100 cm3
a. 71
b. 52
c. 67
d. 191
e. 208
c
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The transitions of an electron in the hydrogen atom to the n = 3 level result in the
a. Lyman series. b. Balmer series. c. Paschen series. d. Bohr series.
Red dwarf stars (stars between 0.08 and 0.5 solar masses) evolve very differently than other stars as they age because ____
a. they are formed from pure hydrogen b. they never reach the minimum temperature required to fuse carbon c. they never form white dwarf as remnants d. they are always part of a close binary system e. their interiors are well mixed, through strong convection
Which of the following is not a feature of the Sun's
surface? a) sunspots. b) prominences. c) flares. d) rills.
Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
A. (?3, ?1) m B. (+1, +3) m C. (+3, ?1) m D. (?1, ?3) m E. (?0.5, ?2) m