Which of the following best describes the principle advantage of CCDs over photographic film?
A) CCDs allow long exposures (e.g., minutes or hours) and film does not.
B) CCDs capture a much higher percentage of the incoming photons than film.
C) CCDs can record the colors of astronomical objects accurately while film cannot.
D) CCDs can be attached to modern telescopes more easily than can photographic film.
B
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The flow patterns found on the surface of Mars and the number of craters on top of them suggest that
a. Mars is today a liquid, water-rich world. b. the climate on Mars was different billions of years ago. c. volcanism is occurring on Mars. d. the polar caps are made of liquid water. e. All of the other choices are correct.
A 20-solar-mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a
A) day. B) week. C) month. D) year. E) century.
Work Done by a Gas: While 3.0 moles of gas expand from an initial volume of 0.040 m3 to a final volume of 0.085 m3, the temperature of the gas is kept fixed at 300 K. How much work does the gas do during this expansion? (R = 8.31 J/mol ? K)
A. 5.6 kJ B. 6.6 kJ C. 7.6 kJ D. 8.6 kJ E. 14 kJ
The discovery of hot Jupiters led scientists to reconsider the nebuar theory. Which of the following best explains why the nebular theory(as it stood before the discoveries of extrasolar planets) had not predicted the existence of hot Jupiters?
What will be an ideal response?