Three capacitors of capacitance 6 ?F each are given. The minimum and maximum capacitance, which may be obtained are?
A. 6 ?F, 18 ?F
B. 3 ?F, 12 ?F
C. 2 ?F, 12 ?F
D. 2 ?F, 18 ?F
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A series LR circuit includes a 9.0 V battery, a resistance of 0.50 
and an inductance of 0.80 H. When the switch is closed, how long does it take for the current to reach one half of its maximum value?
A. 0.80 s B. 1.6 s C. 2.3 s D. 1.1 s E. 0.55 s
What is one reason that early life formed cells?
A) cell walls prevent heat from escaping B) cells concentrate molecules together so they react more easily C) only cells can replicate D) biological reactions can occur only within cells
When you look through a sheer curtain at a distant street lamp, you see a pattern of colored spots of light. This occurs by
a. polarization of light in scattering and partial absorption by the threads. b. interference of light waves that pass through the threads with light waves that pass through the openings between the threads. c. refraction of light waves differentially in the cylindrical threads. d. diffraction of light waves passing through the two dimensional pattern of openings between the threads. e. reflection of light waves by the sides of the threads.
The radiation emitted from a star has a maximum intensity at a wavelength of 300 nm. What is the temperature of this star?
a. 300 K b. 100 K c. 900,000,000 K d. 90,000 K e. 10,000 K