The diameter of an atom is 1.4 × 10-10 m and the diameter of its nucleus is 1.0 × 10-14 m. What fraction of the atom's volume is occupied by its nucleus?
A) 3.6 × 10-13
B) 7.1 × 10-5
C) 5.1 × 10-9
D) 2.6 × 10-17
A
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What do "forbidden" lines reveal about interstellar space?
A) The density or pressure of this gas is much lower than can be produced in a laboratory. B) The laws of physics are not the same in space as they are on Earth. C) There are unknown elements in space that do not correspond to elements found on Earth. D) There are molecules found in meteorites and interstellar dust that are not found on Earth. E) All of the above are true.
The number of protons in the nucleus of an atom tells which element it is
a. True b. False Indicate whether the statement is true or false
A heat engine receives 7000 J of heat and loses 3000 J in each cycle. What is the efficiency of this engine?
A) 30% B) 43% C) 57% D) 70%
A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth, Andrea rides on a space ship which travels away from Earth at a speed of 0.6c for five years (as measured by Courtney),
then turns around and comes back at 0.6c. When Andrea returns, Courtney is 20 years old. How old is Andrea upon her return? A) 10 years B) 12 years C) 15 years D) 18 years E) 20 years