An atmosphere can escape a planet if the escape velocity is six times the average molecular speed at that temperature
Indicate whether the statement is true or false
TRUE
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What is the MOST important role that nucleic acids play in living organisms on Earth?
A) long-term energy storage and cell structure B) basic functioning of living organisms C) the storage and transfer of information D) short-term energy storage
When the tiny hole in a pinhole camera is made larger, the image is
A) brighter but less clear. B) clearer. C) right-side up. D) none of the above
This figure shows idealized thermal radiation spectra from several stars and a human. Based on this graph, at about what wavelength does a 15,000 K star emit its most intense light?
A) about 100 nanometers B) about 1,000 nanometers C) about 20 nanometers D) about 100,000 nanometers
Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space?
A) The cloud is extremely hot. B) The cloud is visible primarily because it reflects light from nearby stars. C) The cloud is cool and very dense, so that you cannot see any objects that lie behind it. D) The cloud is cool and lies between you and a hot star.