Archaeopteryx fossils are those of a prehistoric
a. bird.
b. crinoid.
c. trilobite.
d. ground sloth.
a
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The supermassive black hole at the center of the galaxy is:
A.) 15 light-years away. B.) 300 light-years away. C.) 8,800 light-years away. D.) 26,000 light-years away. E.) 90,000 light-years away.
If Earth's mass were suddenly and magically reduced to half its present value, the Sun's gravitational force on Earth would
A. be reduced by a factor of 4. B. be reduced by a factor of 2. C. remain the same. D. increase by a factor of 2.
A rock sample contains 1/2 microgram of the parent radioactive isotope U-235 and 1/2 microgram of its daughter isotope Pb-207. If the half-life of this decay is 700 million years, how old is this rock?
A) 1400 million years B) 2100 million years C) 700 million years D) 350 million years
The pupil of the eye increases in size under which condition?
a. eye is focused on a distant object b. eye is focused on a nearby object c. object viewed is dimly illuminated d. object viewed is well illuminated