A key component of one type of spectroscope for visible radiation is the
A) filter for separating the different gases.
B) magnet for bending the radiation beam.
C) electrostatic plate for bending and separating the radiation beam.
D) prism for separating the radiation beam.
E) mirror for separating the radiation beam.
D
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A refrigerator has a COP of 2.5. If it removes 7.7 MJ of heat in 25. minutes,
(a) what is the minimum power motor to operate the refrigerator? (b) what is its efficiency if it were a reversible engine?
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.
A 5kg rock and a 10kg rock are dropped from a height of 10m. Which of the following statements describes what happens to the potential energy of the rocks?
a) Neither rock loses potential energy because no work is done on the rocks. b) Bother rocks lose the same amount of potential energy because they fall from the same height. c) The 10kg rock loses more potential energy than the 5kg rock because the 10kg rock falls faster. d) The 10kg rock loses more potential energy than the 5kg rock because the 10kg rock has more mass.
If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror, the required length of the mirror:
a. is equal to the height of the man. b. is equal to one half the height of the man. c. depends on the distance the man stands from the mirror. d. depends on both the height of the man and the distance from the man to the mirror.