Which ray diagrams are correct? The three rays in each diagram are distinguished by different types of lines. Hint: Check the behavior of each ray as it interacts with the lens.
A. B and C
B. C and D
C. D and E
D. C and E
E. C, D and E
Answer: E
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Lenz's Law: As shown in the figure, two solenoids are in line. The switch S, initially closed, is suddenly opened. Just after opening S, what is the polarity of the induced emf in terminals X and Y?
A. X and Y are at the same potential. B. X is positive and Y is negative. C. Y is positive and X is negative.
Which of the following kinds of signal do we currently have the best chance of detecting with currently technology?
A) a signal used for communication between a civilization's home world and another star system B) a signal used for communication between a civilization's home world and another planet in its own planetary system C) an intentional signal beacon D) a signal used for local communication in the world where the intelligent beings exist
An automobile travels due north with a constant speed of 81 km/h. All forces considered, the unbalanced force acting on the auto is
a. zero. b. southward. c. northward. d. downward. e. upward.
Given that the binding energy of the hydrogen atom in its ground state is -13.6 eV, what is the energy when it is in the n = 5 state?
A) -2.72 eV B) 0.544 eV C) -0.544 eV D) 2.72 eV