What do we mean by time dilation in relativity? A) It is the ...

[theo]

What do we mean by time dilation in relativity?
 
  A) It is the idea that time seems to run slower in reference frames moving relative to you, but time really is the same for everyone.
  B) It is the idea that relativity makes time dilate, or expand, for people who study it.
  C) It is a hallucinogenic effect experienced by people who take too much of something.
  D) It is the idea that time really runs slower in reference frames moving relative to you.

Question 2

The measured value of the speed of light is about 300,000 km/s. Suppose a futuristic space train is traveling at 200,000 km/s with its headlights on. If you could measure the speed of the light from the headlights, you would find it to be
 
  A) 200,000 km/s.
  B) 100,000 km/s.
  C) 300,000 km/s.
  D) 500,000 km/s.

[succesfull]

Answer to Question 1

D

Answer to Question 2

C

[theo]

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