The asteroid belt is between the orbits of
a. Earth and Mars.
b. Mars and Jupiter.
c. Earth and Venus.
d. Jupiter and Saturn.
b
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Magnetic fields are produced by
A. constant electric currents. B. electric currents that vary sinusoidally with time. C. time-varying electric fields. D. all of the above. E. only (a) and (b) above.
Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body now
a. decreases by 1/4. b. decreases by 1/2. c. stays the same. d. increases by 2 times. e. increases by 4 times.
Special relativity tells us that
A) the speed of light is variable. B) light moves faster if emitted by a source moving in the direction of emission. C) light moves faster if emitted by a source moving in the direction of emission and light moves slower if emitted by a source moving in the direction opposite the emission. D) light moves slower if emitted by a source moving in the direction opposite the emission. E) light moves at the same speed independent of the motion of the source.
Which of the following types of electromagnetic radiation has the highest frequency?
a. X-rays b. visible light c. radio d. gamma rays e. infrared radiation