A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
a. 2.8
b. 1.7
c. 1.3
d. 4.0
e. 1.0
c
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You can hear sound through an open window from sources that are not in your line of sight because of diffraction
a. True b. False Indicate whether the statement is true or false
The ______________ distance is used in calculating work
a. normal b. square of c. perpendicular d. parallel
If the rock particles in a sedimentary rock are relatively small with well sorted and well rounded grains, we can infer that the sediment grains traveled a
A) short distance. B) long distance for a long time. C) long distance in a short time. D) short distance for a long time.
The line representing latitude 45 degrees north runs through the state of Michigan. In Michigan, when is the Sun is directly overhead, at your zenith?
A) every day B) only on the spring and fall equinoxes C) only on the summer solstice, noon D) never