Which of these are physical quantities?
a. time
b. energy
c. seconds
d. kilometers
e. volume
a, b, e
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About what percent of Earth's water is fresh water?
a. 8% b. 18% c. 2% d. 15%
Blue light hitting a red sweatshirt is an example of
A) emission. B) reflection or scattering. C) transmission. D) absorption.
The spacing of the surface planes of a crystal is 159 pm. A beam directed normally at the surface of the crystal undergoes first order diffraction at an angle of 58° from the normal. The diffraction is done with a beam of monoenergetic neutrons
The energy of the neutrons is closest to: A) 0.045 eV B) 0.039 eV C) 0.050 eV D) 0.056 eV E) 0.061 eV
The information on a one-gallon paint can is that the coverage, when properly applied, is 270 ft2 . One gallon is 231 in3 . What is the average thickness of the paint in such an application?
a. 0.0036 in. c. 0.043 in. b. 0.0059 in. d. 0.053 in.