The cheapest and probably most effective means of interstellar communication is ________
Fill in the blank(s) with correct word
radio broadcasts
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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
Two red stars have surface temperatures of 3000 K, but Star A's luminosity is about 5% of the Sun's and Star B's luminosity is about 32,000 times the luminosity of the Sun. How much bigger is star B than star A?
A) They are the same size. B) Star B's radius is about 16 times larger than star A's radius. C) Star B's radius is about 800 times larger than star A's radius. D) Star B's radius is about 640,000 times larger than star A's radius. E) This cannot be determined from the information given.
Neptune has a single, broad ring that is extremely thin
Indicate whether the statement is true or false
In a photoelectric effect experiment, light of a single wavelength is incident on the metal surface. As the intensity of the incident light is increased
A. the stopping potential decreases. B. the stopping potential increases. C. the work function decreases. D. the work function increases. E. None of these choices are true.