Why are sunspots cooler than the surrounding solar surface?
A) They are regions where convection carries cooler material downward.
B) Strong magnetic fields slow convection and prevent hot plasma from entering the region.
C) Magnetic fields trap ionized gases that absorb light.
D) There is less fusion occurring there.
E) Magnetic fields lift material from the surface of the Sun, cooling off the material faster.
B) Strong magnetic fields slow convection and prevent hot plasma from entering the region.
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Which is more dangerous, touching a faulty 110-volt light fixture, or a Van de Graaff generator charged to 100,000 volts?
A) touching the light fixture B) touching the generator C) touching both are about equally dangerous.
A light bulb with a tungsten filament is attached to a source of variable voltage. As the voltage is increased on the bulb,
a. the bulb's resistance decreases. b. the bulb's resistance increases. c. the current in the bulb decreases. d. the power dissipated remains constant.
If Earth were twice as massive but it revolved at the same distance from the Sun, its orbital period would be
A) 4 years. B) 3 years. C) 2 years. D) 1 year. E) 6 months.
The local solar time at 75°W is 12:00 noon. What is the longitude of an observer who sees the full moon on her meridian at this time?
a. 105°E b. 75°E c. 15°E d. 15°W e. None of the above