Some alpha particles fired at a gold foil bounced backward as a result of
A) reflection from the surfaces of gold atoms.
B) electrostatic repulsion by gold nuclei.
C) electrostatic repulsion by electrons within gold atoms.
D) all of the above
E) none of the above
Answer: B
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Which of the following is not a pattern of motion in our solar system?
A) Planets all orbit in the same direction. B) Planets all rotate in the same direction. C) Planets all orbit the same direction as the Sun's spin. D) Large planets all have many moons orbiting them.
Seal level is rising from global warming. The main cause is
A. expanding sea water B. melting glaciers C. expanding rock under the sea D. contracting earth (while the water stays constant)
The orbit of the planet Jupiter is ellipse with the Sun at one focus. What is located at the other focus?
a. The asteroid belt b. Earth c. Saturn d. Jupiter e. Nothing
What conditions are necessary for a total solar eclipse?
A) new moon on ecliptic near perigee B) full moon on ecliptic near aphelion C) new moon on equator at perigee D) full moon on equator at perigee E) new moon on ecliptic near aphelion