EMF's from electrical lines ________
a. drop off with the distance squared from the line
b. are only an influence for high voltages
c. have been positively shown to cause cancer in children
d. are not important inside houses.
a
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The case of Mars tells us that which of the following is a critical factor in determining surface habitability?
A) planetary size B) levels of geological activity C) distance from the Sun D) the presence of a magnetic field
Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.)
A) Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other. B) The luminosity of Star 1 is a factor of 100 less than the luminosity of Star 2. C) Star 1 is 100 times more distant than Star 2. D) Star 1 is 100 times nearer than Star 2. E) Star 1 is 10 times more distant than Star 2.
A rod (length = 2.0 m) is uniformly charged and has a total charge of 40 nC. What is the magnitude of the electric field at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?
A. 40 N/C B. 45 N/C C. 24 N/C D. 90 N/C E. 36 N/C
Why do gamma ray telescopes have poor angular resolution?
What will be an ideal response?