Assuming the conditions ripe for life and intelligence abound in the Galaxy, what factor limits the number of galactic civilizations currently in existence?
A) the average survival time of the civilizations
B) the lack of metals for technology
C) the speed of technological development
D) the expansion of the universe
E) the number of supernova explosions
A
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Which of the 4 fundamental forces binds the nucleus together, and which binds the atom [the electron orbits] together?
A) Strong nuclear force binds the nucleus, weak nuclear force binds the atom. B) Strong nuclear force binds the nucleus, electric force binds the atom. C) Weak nuclear force binds the nucleus, strong nuclear force binds the atom. D) Gravity binds the nucleus, electric force binds the atom. E) Electric force binds the nucleus, strong nuclear force binds the atom.
What happens to the frequency of the scattered X-rays beam as the scattering angle in the Compton effect decreases?
A) It stays the same. B) It decreases. C) It increases. D) Not enough information
The background hiss that Bell Labs detected was the best observational evidence for the Big Bang
Indicate whether the statement is true or false
Currently, which of the following gases contributes the most toward the greenhouse effect?
What will be an ideal response?