The ______________ calendar is most used around the world
a. Roman
b. Julian
c. Gregorian
d. Babylonian
c
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If the ground state energy level of an electron in a rigid box is 5.0 eV, what is the width of the box?
A) 2.3 × 10-11 m B) 7.3 × 10-20 m C) 2.7 × 10-10 m D) 1.0 × 10-10 m E) 9.1 × 10-21 m
Entropy is
A. something that never locally decreases in any process. B. a quantity that increases as the disorder of a system increases. C. another term for heat. D. a quantity that is conserved in any thermal process.
A star on the upper edge of the main sequence denotes that:
A) it has exhausted nearly all hydrogen in its center. B) it has reached stability for the first time. C) it is in the zero-age main sequence. D) it is converted into a brown dwarf.
A gravitational wave can carry energy away from two very dense objects if they are orbiting each other or collide.
Answer the following statement true (T) or false (F)