Why do Jupiter, Saturn, Uranus, and Neptune all have rings?
a. They were left over from solar system formation.
b. They all captured particles.
c. All four planets had a large moon that disintegrated.
d. All have small moons and orbiting particles that constantly collide and make rings.
Answer: d. All have small moons and orbiting particles that constantly collide and make rings.
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How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk?
A) It should have a higher fraction of elements heavier than hydrogen and helium. B) It should orbit the galactic center at a much higher rate of speed. C) It should be higher in mass. D) It should be moving very fast relative to the Earth.
When you decrease, by a factor of two, the wavelength of the light causing photoelectrons to be emitted from a metal surface, the kinetic energy of the photoelectrons will
A) decrease by a factor of 2. B) double C) more than double. D) increase by a factor of . E) decrease by a factor of .
The discovery of the cosmic microwave background was important because
A) its detection was a major advance in microwave testing. B) it was experimental verification of a prediction from the Big Bang theory. C) it showed the universe must be closed, with more than the critical density here. D) it established a firm center of the universe. E) it proved that astronomy at radio wavelengths was possible.
A concave mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?
A) 50 cm B) 20 cm C) 15 cm D) 7.5 cm E) 5.0 cm