An individual's eye pupil changes from a diameter of 1.5 mm to 3.5 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
a. 2.0
c. 0.43
b. 2.3
d. 0.65
C
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Detonation of a fission-type uranium bomb begins by
A) splitting uranium. B) pressing together pieces of uranium. C) igniting a small conventional bomb. D) all of the above E) none of the above
Most of the current star formation in the Milky Way occurs in its spiral arms
Indicate whether the statement is true or false
Which of the following best describes what would happen if a 1.5-solar-mass neutron star, with a diameter of a few kilometers, were suddenly (for unexplained reason) to appear in your home town?
A) The combined mass of Earth and the neutron star would cause the neutron star to collapse into a black hole. B) It would rapidly sink to the center of Earth. C) The entire Earth would end up as a thin layer, about 1 cm thick, over the surface of the neutron star. D) It would crash into Earth, throwing vast amounts of dust into the atmosphere that, in turn, would cool the Earth; this is probably what caused the extinction of the dinosaurs.
Ultraviolet light has wavelengths that are ________ visible wavelengths.
A. the same energy as B. slower than C. shorter than D. faster than E. longer than