Light at the peak frequency of an incandescent lamp depends on the
A) amount of electrical energy transformed.
B) rate of atomic and molecular vibrations.
C) voltage applied to the lamp.
D) electrical resistance of the lamp.
E) transparency of glass.
Answer: B
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Which statement about young stars is FALSE?
A) They contain a larger fraction of heavy elements than previous generations. B) They are born in a dustier environment than earlier generations. C) They are more likely to have planets forming with them than earlier generations. D) The high mass stars will be more likely to produce heavier elements as they evolve. E) Being young, they will have more pure hydrogen than earlier generations.
Although electrons in metal move in haphazard directions at many times the speed of sound, the drift speed of electrons that compose electric current is
A) a fraction of a centimeter per second. B) many centimeters per second. C) the speed of a sound wave. D) the speed of light. E) none of the above
Object 1 has twice the mass of Object 2 . Both objects have the same kinetic energy. Which of the following statements is true?
a. Both objects can have the same magnitude of momentum. b. Object 1 has a momentum of greater magnitude than Object 2. c. The magnitude of the momentum of Object 2 is four times that of Object 1. d. All the statements are false.
Two particles, each having a mass of 3.0 ?g and having equal but opposite charges of magnitude 5.0 nC, are released simultaneously from rest when the two are 5.0 cm apart. What is the speed of either particle at the instant when the two are separated by 2.0 cm?
A. 2.1 m/s B. 1.5 m/s C. 1.8 m/s D. 2.4 m/s E. 3.2 m/s