Which of the following kinds of signal do we currently have the best chance of detecting with currently technology?

A) a signal used for communication between a civilization's home world and another star system
B) a signal used for communication between a civilization's home world and another planet in its own planetary system
C) an intentional signal beacon
D) a signal used for local communication in the world where the intelligent beings exist


C

Physics & Space Science

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A) infrared and radio B) ultraviolet and x-rays C) visible light D) infrared and ultraviolet

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In optical fibers of uniform density, light actually

A) curves in a direction parallel to the central axis of the fiber. B) travels in straight-line segments. C) travels along the outer surface of the fiber. D) none of the above

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The pitch of a sound is determined primarily by its

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a. 6 m/s² b. 2 m/s² c. 8 m/s² d. 4 m/s²

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