An electron which moves from the negative to the positive terminal of a 2.0 volt battery loses how much potential energy?
A) 2.0 J
B) 4.2 × 10-19 J
C) 2.0 × 10-19 J
D) 2.0 eV
E) 3.2 J
D
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The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be
A) 50 V. B) 100 V. C) 200 V. D) none of the given answers.
In the context of the excitation of atoms, jumps of electrons from one orbit to another are sometimes called__________
A) magnetic jumps B) transitional jumps C) filtered jumps D) quantum jumps
Two children start at one end of a street, the origin, run to the other end, then head back. On the way back Joan is ahead of Mike. Which statement is correct about the distances run and the displacements from the origin?
A. Joan has run a greater distance and her displacement is greater than Mike's. B. Mike has run a greater distance and his displacement is greater than Joan's. C. Joan has run a greater distance, but her displacement is less than Mike's. D. Mike has run a greater distance, but his displacement is less than Joan's. E. Mike has run a shorter distance, and his displacement is less than Joan's.
The radius of a star is 6.95 × 108 m, and its rate of radiation has been measured to be 5.32 × 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of this star? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 6.27 × 103 K B) 8.25 × 103 K C) 5.78 × 107 K D) 3.93 × 107 K E) 8.87 × 103 K