The pupil of a person's eye changes from a diameter of 3.5 mm to 1.5 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
A) 0.43 B) 2.3 C) 0.65 D) 2.0
B
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The principle of continuity states that for fluid flow to be continuous it must
A) speed up in narrow regions of flow. B) slow down in wide regions of flow. C) both of these D) neither of these
In an X-ray diffraction experiment using X-rays of ? = 0.500 × 10^?10 m, a first-order maximum occurred at 5.00°. Find the crystal plane spacing
a. 2.87 × 10^?10 m b. 1.36 × 10^?10 m c. 6.24 × 10^?9 m d. 1.93 × 10^?9 m e. 5.74 × 10^?9 m
Why is Mars' greenhouse effect negligible compared to that of Earth's?
A) Its mass is only one-ninth of Earth's. B) Greenhouse gas emissions were greatly curtailed according to the International Mars Greenhouse Gas Reduction Treaty of 2003. C) The Martian atmosphere is much thinner and retains little heat. D) Martian carbon dioxide contains a rare isotope with little ability to trap heat.
In strength, the magnetic fields of Uranus and Neptune are:
A) very different, with flopped over Uranus having no field, and Neptune a strong one. B) similar, with both about 100 times stronger than our own. C) even stronger than that of Jupiter. D) perfect fits for the Dynamo theory. E) like Jupiter and Saturn, due to mantles of liquid metallic hydrogen.