The two major physical theories of the 20th century are
A) superconductivity and the theory of light.
B) electromagnetic theory and quantum theory.
C) quantum theory and the theory of relativity.
D) the theory of relativity and electromagnetic theory.
E) electromagnetic theory and the theory of gravity.
Question 2
In an air-free chamber, a pebble is thrown horizontally, and at the same instant a second pebble is dropped from the same height. Compare the times of fall of the two pebbles.
A) The thrown pebble hits first.
B) The dropped pebble hits first.
C) They hit at the same time.
D) We cannot tell without knowing which pebble is heavier.
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