If two sources of slightly different frequency and different amplitudes create waves at the same time, the resulting superposition of those waves can be described as
A)
a wave with an amplitude that varies from zero to an amplitude equal to the sum of individual amplitudes. This variation would occur at a frequency equal to the difference in source frequencies.
B)
a standing wave with an amplitude equal to the average of the amplitudes of the individual waves and a frequency equal to the average of individual frequencies.
C)
a wave with an amplitude that varies from an amplitude of the difference in individual amplitudes to an amplitude equal to the sum of individual amplitudes. This variation would occur at a frequency equal to the difference in source frequencies.
D)
a standing wave with an amplitude equal to the sum of the amplitudes of the individual waves and a frequency equal to the average of individual frequencies.
E)
a standing wave with an amplitude equal to the product of the amplitudes of the individual waves and a frequency equal to the sum of individual frequencies.
C
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Potential Energy: A +7.5-nC point charge is 5.0 cm from a -9.4-µC point charge in your laboratory in California. How much work would you have to do if you left the +7.5-nC charge in the lab but took the -9.4-µC charge to New York City? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
Fill in the blank(s) with the appropriate word(s).
As a normal object’s thermal energy U goes to zero, the slope of a graph of its entropy S versus U
A. approaches infinity. B. approaches some positive value less than infinity. C. approaches zero. D. approaches some finite negative value. E. approaches negative infinity. F. depends entirely on the object’s properties.
In vacuum, the components of an EM wave are 
and 
0. What 
?
a. 
b. 
c. 
d. 
e. More information is needed.
A string with a mass per length of 2.00 g/m is stretched between two points that are 0.400 m apart. The second mode frequency of the stretched string is 50.0 Hz lower than the third mode frequency. What is the tension in the string?
A. 400 N B. 375 N C. 321 N D. 281 N E. 250 N