Why do you think air is such a poor conductor com-pared to a metal (at normal field strengths)?
A. Air is much less dense than a metal.
B. Electrons can travel much farther in a metal before col-liding with an atom than they can in air.
C. Air molecules are much bigger than metal atoms.
D. Electrons move much more slowly in air.
E. Air normally has very few free charge carriers.
E. Air normally has very few free charge carriers.
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Planetary systems discovered around other stars
A) all have exactly the same layout as the planets in our own solar system B) all have completely different layouts as the planets in our own solar system C) exhibit a range of different layouts, some being very similar to our solar system while others being very different D) all have very similar but not identical layout to our solar system
The sulfur hexafluoride molecule consists of one sulfur atom and six fluorine atoms. The atomic masses of sulfur and fluorine are 32.0 u and 19.00 u, respectively. What mass does one mole of this gas have?
a. 32.0 g b. 51.0 g c. 146 g d. 608 g
A person looking through eyeglasses sees
a. real images b. virtual images c. erect images d. inverted images e. polarized images
The voltage supplied to an ac circuit is given by v = 120 sin(377t). What is the voltage at 
A. 0.00 V B. 2.37 V C. 63.0 V D. 109 V E. 119 V