A resistor is made of a material that has a resistivity that is proportional to the current going through it. If the voltage across the resistor is doubled, what happens to the current through it?
a. It doubles.
b. It quadruples.
c. It increases by a factor of 23/2.
d. It increases by a factor of 21/2.
d
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Work Done by a Gas: The figure shows a pV diagram for an ideal gas that is carried around a cyclic process. How much work is done in one cycle if p0 = 4.00 atm and V0 = 3.00 L? (1.00 atm = 101 kPa)
A. 1210 J B. 485 J C. 2280 J D. 2420 J E. 4850 J
Double-Slit Interference: In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750 nm and 900 nm, illuminate the slits. A screen is placed 2.0 m from the slits. At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other?
A. 1.5 mm B. 3.0 mm C. 4.5 mm D. 6.0 mm
The conservation of energy equation must include
A. Work done on the system B. Thermal energy added to the system C. Thermal energy leaving the system D. Work done by the system. E. All of these are correct.
The physics underlying photovoltaic solar cells is
A) electron diffraction. B) photon capture. C) the photoelectric effect. D) none of the above