Which of the following is a difference between Saturn and Jupiter?
A) Unlike Jupiter, Saturn is rich in hydrogen and helium.
B) Saturn has more liquid metallic hydrogen than Jupiter.
C) Belts and zones on Saturn are less visible than on Jupiter.
D) Unlike Jupiter, Saturn radiates more energy than it receives.
C
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Two tuning forks sounding together result in a beat frequency of 3 Hz. If the frequency of one of the forks is 512 Hz, what is the frequency of the other?
a. 509 Hz or 515 Hz c. 518 Hz or 506 Hz b. 105 Hz d. 85 Hz
At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 60,000 K?
a. 50 nm b. 500 nm c. 300 nm d. 1.8 × 10^11 nm e. 180 nm
As you saw in Part C, stellar parallax exists only because Earth orbits the Sun. Therefore, if the ancient Greeks had measured stellar parallax, they would have known that their belief in an Earth-centered universe was wrong. Why didn't the ancient Greeks measure stellar parallax?
A. Some Greeks actually did measure it, but they did not understand the importance of their measurements. B. Even for the nearest stars, parallax angles are too small to measure with the naked eye. C. Their belief in an Earth-centered universe meant that they did not expect parallax, and therefore did not look for it. D. The Greeks thought all the stars were the same distance away, residing on a celestial sphere.
For the first 1 billion years of Earth's evolution, the fraction of oxygen in its atmosphere was approximately
a. zero. b. half of what it is today. c. 2 times what it is today. d. 10 times what it is today. e. the same as it is today.