The mass density of pure water is 
If the molecular mass of water is 18.0 u, how many water molecules are in spherical water balloon of radius 1.0 cm?
a. 
b. 
c. 
d. 
c.
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Deuterium and helium could be made only during the nuclear epoch
Indicate whether the statement is true or false
Neutral hydrogen can be detected because its electron occasionally ________ its spin and creates the 21-cm emission line for radio observers
Fill in the blank(s) with correct word
A nearsighted person requires glasses with lenses that are
A. diverging, to see near objects. B. converging, to see near objects. C. converging, to see distant objects. D. diverging, to see distant objects.
Suppose that the energy difference between adjacent energy levels for an oscillator in an Einstein solid is ? = 0.005 eV. At room temperature, the value of T/TE is
A. quite a bit smaller than 1 B. about equal to 0.5. C. about equal to 1. D. about equal to 2. E. quite a bit larger than 2. F. One doesn’t have enough information to tell.