Doubling the number of loops of wire in a coil produces what kind of change on the induced emf, assuming all other factors remain constant?
A) The induced emf is 4 times as much.
B) There is no change in the induced emf.
C) The induced emf is twice as much.
D) The induced emf is times as much.
E) The induced emf is 3 times as much.
C
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The Leonid meteor shower occurs in mid-November. Which of the following statements regarding the Leonids is true?
A. The shower is best observed very early in the morning, before dawn. B. The radiant of the meteor shower is in the constellation of Leo. C. The shower occurs when Earth crosses the path of an old comet. D. All of these choices are correct.
Three Carnot engines operate between temperature reservoirs as follows: Engine A: Th = 1300 K, Tc = 1000 K; Engine B: Th = 1000 K, Tc = 700 K; Engine C: Th = 500 K, Tc = 350 K. Which two engines have the same thermal efficiency?
a. A and B b. B and C c. A and C d. No two have the same thermal efficiency.
Sally places an object 6.0 cm from a thin, convex lens along its axis. The lens has a focal length of 12 cm. What are the respective values of the image distance and magnification?
a. 12 cm and -2.0 c. 3.0 cm and -0.50 b. –12 cm and 2.0 d. -6.0 cm and -1.0
What energy must be added or given off in a reaction where a helium atom is separated into two hydrogen atoms and two neutrons? (Atomic masses for each: hydrogen, 1.007825 u; neutron, 1.008665 u; helium, 4.002602 u; also, 1 u = 931.5 MeV/c2.)
a. 28.3 MeV given off c. 20.7 MeV given off b. 20.7 MeV added d. 28.3 MeV added