A hologram is simply a
A) complex diffraction grating.
B) thin sheet of non-cubic transparent crystals.
C) pair of semi-crossed polarization filters.
D) thin photographic film with microscopic images over the entire surface.
E) none of the above
Answer: A
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Aluminum has a resistivity of 
What is the resistance of 15 m of aluminum wire of cross-sectional area 1.0 mm2?
A. 1.6
B. 0.40
C. 0.13
D.
E. 56
Which of the following is true of double-lobed radio sources?
A) Their radio lobes are associated with interacting galaxies. B) They are less active than normal galaxies. C) Their nuclei are relatively cooler than their peripheries. D) Their radio lobes are located at the end of their spiral arms.
This diagram shows how light from a binary star system would travel to Earth if the speed of light were not constant. What is its observational significance?
A) It tells us that if the speed of light were not the same for everyone, then we would not necessarily see binary stars as distinct objects. B) It shows that time runs slower for fast-moving objects. C) It shows that motion is relative. D) It shows that observers in different reference frames will not necessarily agree when two events are simultaneous.
What unusual discovery was made about the Murchison Meteorite?
A) It is from Mars. B) It contains iron. C) It contains living cells. D) It contains amino acids. E) It is the largest known meteorite.