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Author Question: When white light passes through a cool cloud of gas, we see A) visible light. B) infrared light. ... (Read 170 times)

rlane42

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on: Jul 27, 2018
When white light passes through a cool cloud of gas, we see
 
  A) visible light.
  B) infrared light.
  C) thermal radiation.
  D) an absorption line spectrum.
  E) an emission line spectrum.

Question 2

If we had sent a radio signal to an advanced civilization in 2006 which is located in the zeta reticuli star system approximately 39 light-years away and the signal was immediately replied to, when would the reply arrive back at Earth?
 
  A) 2084
  B) 2012
  C) 2045
  D) 2039


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xiaomengxian

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Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

A


rlane42

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Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

Dominic

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Reply 3 on: Yesterday
Excellent

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