The frequency of an electromagnetic wave and the frequency of the vibrating electrons that produce it are
A) nearly the same.
B) the same.
C) quite different.
Answer: B
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When a gas in a container is squeezed to half its volume at constant temperature, its density
A) halves. B) doubles. C) quadruples. D) remains the same.
The atmosphere on Mercury is due to
A) volcanic outgassing. B) evaporation. C) sublimation. D) bombardment. E) There is no detectable atmosphere on Mercury.
You would like to buy a full-length mirror which allows you to see yourself from head to toe. The minimum height of the mirror is
A. half your height. B. two-thirds of your height. C. equal to your height.
A long nonconducting cylinder (radius = 12 cm) has a charge of uniform density (5.0 nC/m3) distributed throughout its volume. Determine the magnitude of the electric field 15 cm from the axis of the cylinder
a. 20 N/C b. 27 N/C c. 16 N/C d. 12 N/C e. 54 N/C