Monochromatic light is light of a single
A) wavelength.
B) frequency.
C) color.
D) all of the above
E) none of the above
Answer: D
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Which of the following microscopes is not capable of resolving individual atoms?
(a) An SEM operating at 30 kV (b) A TEM operating at 200 kV (c) An STM (d) An AFM
A triatomic molecule is oriented as follows along the x-axis: mass m is at the origin, mass 2m is at x = a, and, mass 3m is at x = 2a. What is the moment of inertia of this molecule about the y-axis?
A) 2ma2 B) 3ma2 C) 12ma2 D) 14ma2
A 75.0 kg ladder that is 3.00 m in length is placed against a wall at an angle theta. The center of gravity of the ladder is at a point 1.2 m from the base of the ladder. The coefficient of static friction at the base of the ladder is 0.400. There is no friction between the wall and the ladder. What is the minimum angle the ladder makes with the horizontal for the ladder not to slip and fall?
A. 35 degrees
B. 45 degrees
C. 53 degrees
D. 60 degrees
E. 65 degrees
Which is more common: a star blows up as a supernova, or a star forms a planetary nebula/white dwarf system?
A) Supernovae are more common. B) Planetary nebula formation is more common. C) They both occur in about equal numbers. D) It is impossible to say.