Which of the following factors in the simplified Drake equation is best known?

A) Nhp, the number of habitable planets in our galaxy
B) fciv, fraction of life-bearing planets where intelligent civilizations have arisen at any time
C) fnow, fraction of civilization-bearing planets that have intelligent civilizations on them now
D) flife, fraction of life-bearing habitable planets


A

Physics & Space Science

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Neptune has a single, broad ring that is extremely thin

Indicate whether the statement is true or false

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The meaning of the word "energy" is immediately clear to anyone

What will be an ideal response?

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Determine the equivalent capacitance of the combination shown when C = 15 mF



a.
20 mF

b.
16 mF

c.
12 mF

d.
24 mF

e.
75 mF

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An absorption spectrum is also called a bright-line spectrum

Indicate whether the statement is true or false

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