Using Maxwell's equations it can be shown that electromagnetic waves have a speed in free space of
A)
(?O?O)-3/2.
B)
(?O?O)-1/2.
C)
?O?O.
D)
(?O?O)-2.
E)
(?O?O)-1.
B
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Reactance: In the circuit shown in the figure, the 60-Hz ac source has a voltage amplitude of 120 V, the capacitive reactance is 820 ?, the inductive reactance is 330 ?, and the resistance is 550 ?. What is the capacitance C of the capacitor?
A. 3.2 µF B. 6.3 µF C. 9.4 µF D. 13 µF E. 20 µF
In casually observing a cup of tea you are
A) affecting its temperature. B) affecting its location. C) both of these D) neither of these
Changes in Earth's thermal balance by decreasing the transparency of the atmosphere to insolation can result from ______________ pollution
Fill in the blank(s) with correct word
Snell's Law: A flashlight beam makes an angle of 60° with the plane of the surface of a calm lake before it enters the water. In the water what angle does the beam make with the plane of the surface? The index of refraction of water is 1.33.
A. 0° B. 30° C. 60° D. 22° E. 68°