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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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
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.