Which of the following molecules would probably be isolated closest to the top of a fractionating tower at a refinery?
A) C4H10
B) C8H18
C) C10H22
D) C20H42
E) C40H82
Answer: A
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For a plane wave approaching an obstacle with a rectangular opening, diffraction becomes important in which of the following circumstances?
A. the beam is coherent B. one or more dimensions of the rectangular opening is near the wavelength of the source C. both dimensions of the rectangular opening are larger than the wavelength of the source D. only if the opening is circular
Determine the equivalent capacitance of the combination shown when C = 12 pF
a.
48 pF
b.
12 pF
c.
24 pF
d.
6.0 pF
e.
59 pF
A 12.0 V battery is placed across a 4.00
resistor. If the current through the resistor is 2.80 A, what is the internal resistance of the battery?
A. 0.200
B. 0.290
C. 4.29
D. 3.71
E. 0.800
The most massive stars have masses somewhere around
A) 5 solar masses. B) 10 solar masses. C) 30 solar masses. D) 150 solar masses. E) 3000 solar masses.