Which isotope of hydrogen is radioactive?
a. Protium
b. Tritium
c. Deuterium
d. Hydronium
b
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A lens of focal length 90 mm is used as a magnifier. The object being viewed is 9.9 mm long, and is positioned at the focal point of the lens. The angle subtended by the image at infinity, in milliradians, is closest to:
A) 110 B) 73 C) 37 D) 147 E) 183
If all the asteroids were gathered into a single object, it would make an object
A) about the size of Earth's moon. B) about the size of the Earth. C) about half the diameter of Earth's moon. D) with enough mass to gather hydrogen and helium and become a gas giant.
As sediments accumulate, compaction and cementation produce sedimentary rock. This process is called
A) consolidation. B) solidification. C) lithification. D) solifluction.
What do the structures of Stonehenge, the Templo Mayor, and the Sun Dagger all have in common?
A) They were all places used for religious sacrifice. B) They were all built on the orders of ancient Mediterranean kings. C) They all can be used as lunar calendars. D) They were all used by ancient peoples for astronomical observations. E) all of the above