The reflection of sound is
A) reverberation.
B) an echo.
C) a rare occurrence.
Answer: B
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Suppose an equation relating position, x, to time, t, is given by x = bt3 + ct4, where b and c are constants. The dimensions of b and c are respectively:
a. T3, T4. c. L/T3, L/T4. b. 1/T3, 1/T4. d. L2×T3, L2×T4.
Two equal positive charges are near each other. If we increase the amount of charge on just one of them, then
A. the strength of the electrical force on both decreases. B. the electric field points toward the larger charge. C. the electric field at the position of the smaller charge increases. D. the larger charge feels a stronger electrical force and the other a weaker electrical force.
Angular Momentum: When is the angular momentum of a system constant?
A. Only when its total kinetic energy is constant. B. Only when no net external force acts on the system. C. Only when the linear momentum and the energy are constant. D. Only when no net external torque acts on the system. E. Only when the moment of inertia is constant.
A common approximation is when the intensity of a sound is doubled, the decibel level increases by 3 . The sound level in a particular location is 100 dB. By what approximate factor is the sound intensity increased if the new decibel level of this sound is 106?
a. 2 b. 3 c. 4 d. 6