Charge of uniform density 12 nC/m is distributed along the x axis from x = 2.0 m to x = 5.0 m. What is the electric potential (relative to zero at infinity) at the origin (x = 0)?
A. 91 V
B. 99 V
C. 82 V
D. 74 V
E. 140 V
Answer: B
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In Problem 4.7, the force in truss member BG is:
(A) 20.83P (B) 0.83P (C) 1.24P (D) 2.08P
A large calorie (Cal) is the amount of heat needed to change the temperature of one ______________ of water by one Celsius degree
a. dekagram b. centigram c. gram d. kilogram
What is the kinetic energy of an electron that passes undeviated through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT?
a. 0.65 eV b. 0.71 eV c. 0.84 eV d. 0.54 eV e. 1.4 eV
What is fluorescence?
a. The emission of light by electrons that have absorbed several infrared photons to reach a higher energy level, before falling down to a lower level. b. Emission of ultraviolet light by passing an electric current through mercury vapor, for example in a fluorescent light bulb. c. Emission of light by electrons in atoms that have absorbed an ultraviolet photon and stayed for some considerable time at higher energy levels before dropping down. d. Emission of light by electrons in atoms after they have absorbed an ultraviolet photon and then dropped down through several energy levels, emitting light in one or more of the steps. e. Light emitted by electrons in atoms after they have absorbed several infrared photons and stayed in the excited state after the infrared light was turned off.