Approximately what proportion of people in the United States believe we have been visited by extraterrestrials?
A) around 33% or a third
B) about 50% or a half
C) less than 1%
D) more than 90%
A
Physics & Space Science
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Radio telescopes which use dishes to gather radio waves are _______ telescopes
a. reflecting b. refracting c. deflecting d. compound e. retracting
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Exclusion Principle: The principal quantum number n can have any integer value ranging from
A. -? to +?. B. 0 to ?. C. 1 to ?. D. 1 to 100.
Physics & Space Science
Dispersion occurs when:
a. some materials bend light more than other materials. b. a material slows down some wavelengths more than others. c. a material changes some frequencies more than others. d. light has different speeds in different materials.
Physics & Space Science
Which of the Jovian planets has the most moons?
a. Jupiter b. Saturn c. Uranus d. Neptune
Physics & Space Science