The nucleus is made of ____
a. electrons only.
b. protons only.
c. neutrons only.
d. electrons and protons, usually.
e. protons and neutrons, usually.
e
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The Saros cycle
a. was used in ancient times to predict eclipses. b. is 18 years, 11 days long. c. accounts for the tides seen on Earth. d. was used in ancient times to predict eclipses and is 18 years and 11 days long, e. None of the other choices are correct.
With molar quantity and temperature held constant, by what factor does the pressure of an ideal gas change when the volume is five times bigger?
a. 1/5 b. 1 c. 5 d. 25
Which of the following wavelengths is common to a 10 cm tube open at both ends and a 15 cm tube open at one end and closed at the other?
1.60 cm 2.30 cm 3.20 cm 4.15 cm 5.5 cm 6.Two of the above 7.Three of the above 8.None of the above
In the late 1800s, Kelvin and Helmholtz suggested that the Sun stayed hot thanks to gravitational contraction. What was the major drawback of this idea?
A) It predicted that the Sun could last only about 25 million years, which is far less than the age of Earth. B) It predicted that the Sun would shrink noticeably as we watched it, and the Sun appears to be stable in size. C) It is physically impossible to generate heat simply by making a star shrink in size. D) It predicted that Earth would also shrink, which would make it impossible to have stable geology on our planet. E) It was proposed before Einstein's theory of general relativity and was therefore incorrect.