In the Drude model of electrical conduction, the current density is directly proportional to
a. the average time interval between successive collisions.
b. the number of charge carriers per unit volume. c. the square of the electron charge. d. the electric field present in the wire. e. the product of all four quantities listed above.
E
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A spectral line produced in the atmosphere of a star may be seen as broad whereas interstellar _______________ lines are very narrow
a. absorption b. continuous c. emission d. All of the other choices are correct.
A young blue star moving along a circular orbit in the disk is a
A. Pop I star. B. Pop II star. C. Pop III star. D. Pop V star.
In a circuit made up of inductor L, resistor R, ammeter, battery, and switch in series, the current is greatest at which of the following times, as measured after the switch is closed?
a. ten time constants c. one time constant b. at a time t = L/R d. zero
The outer core is thought to be molten because it
A) is denser than the inner core. B) will not transmit P-waves. C) is made of iron and nickel. D) will not transmit S-waves.