What happens to the velocity of sound in a gas when the absolute temperature of that gas is doubled?
A) It doubles.
B) It stays the same.
C) It increases to 1.41 times its original value.
D) It quadruples.
C
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If two stars are the same temperature, how can one be more luminous than the other?
A. It can be closer. B. It can be a different spectral type. C. It can have stronger magnetic fields. D. It can have a larger radius. E. It can have a larger reaction rate in the core.
What is the cosmic horizon?
A. the distance beyond which astronomical objects are invisible because their light has not yet reached us B. the diameter of the Universe C. the average distance between galaxies D. the place where the Big Bang occurred
Two objects collide and stick together. Which of the following is false?
A. momentum is conserved B. kinetic energy is lost C. kinetic energy is conserved D. momentum is lost
An induced emf is produced in
A. a closed loop of wire when it remains at rest in a nonuniform static magnetic field. B. a closed loop of wire when it remains at rest in a uniform static magnetic field. C. a closed loop of wire moving at constant velocity in a nonuniform static magnetic field. D. all of the above. E. only (b) and (c) above.