Why are radio waves probably the most efficient way to communicate between civilizations?
A) radio waves are easy to produce and are not affected much by interstellar matter in the galaxy
B) radio waves are the most penetrating of all electromagnetic radiations
C) all advanced civilizations are certain to use radio waves for communication
D) radio waves are the only kind of electromagnetic radiation that can carry information
A
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A) affected by foreign ions. B) the same temperature at which its solid form melts. C) both of these D) neither of these
Suppose we want a satellite to revolve around the earth 5 times a day. What should be the radius of its orbit? (The mass of the earth is 5.97 × 1024 kg, G = 6.67 × 10-11 N ? m2/kg2, and you can neglect the presence of the moon.)
A) 0.690 × 107 m B) 7.22 × 107 m C) 1.44 × 107 m D) 2.11 × 107 m
Explain what a subduction zone is and how it is related to volcanism
What will be an ideal response?
Different observers always agree about the order of events that occur at the same place
Indicate whether the statement is true or false