Author Question: Given that our galaxy has a volume of approximately 8 1012 ly3, what would be the average minimum ... (Read 139 times)

gonzo233 · **on:** Jul 27, 2018

Given that our galaxy has a volume of approximately 8 1012 ly3, what would be the average minimum amount of time to exchange messages between civilizations if there are currently 125,000 intelligent civilizations in our galaxy?

A) 800 years
B) 1,200 years
C) 200 years
D) 400 years

Question 2

Consider two copper wires. One has twice the length of the other. How do the resistivities of these two wires compare?

A) The longer wire has twice the resistivity of the shorter wire.
B) Both wires have the same resistivity.
C) The longer wire has four times the resistivity of the shorter wire.
D) The shorter wire has twice the resistivity of the longer wire.