On any clear night, you can see 3 to 15 meteors per hour
a. True
b. False
Indicate whether the statement is true or false
True
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The average kinetic energy of a nitrogen molecule at room temperature (20°C) is
a. 2 × 10^?21 J. b. 4 × 10^?21 J. c. 6 × 10^?21 J. d. 8 × 10^?21 J. e. 1 × 10^?20 J.
A charge Q is uniformly spread over one surface of a very large nonconducting square elastic sheet having sides of length d. At a point P that is 1.25 cm outside the sheet, the magnitude of the electric field due to the sheet is E
If the sheet is now stretched so that its sides have length 2d, what is the magnitude of the electric field at P? A) 4E B) 2E C) E D) E/2 E) E/4
In a photoelectric effect experiment, the frequency of photons bombarding the surface is increased until photoelectrons just start to leave the surface. If this occurs at a frequency of 
what is the work function of the surface?
A. 1.0 eV B. 1.5 eV C. 2.0 eV D. 2.5 eV E. 3.0 eV
Rub electrons from your hair with a comb and the comb becomes
A) negatively charged. B) positively charged. C) discharged.