Physics Review Question

Unit: Electricity
Year: 1994 Question#: 44
Question: The distance from the moon to Earth is 3.9 x 108 meters. What is the time required for a light ray to travel from the moon to the earth.
(1 ) 0.65s
(2 ) 1.3s
(3 ) 2.6s
(4 ) 3.9s

What is this question really asking?


Explanation by: Eric D

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Answer 1
0.65s

INCORRECT

You divided wrong return to top























Answer 2
1.3s

CORRECT


You divided 3.9 x 108m by 3.0 x 108m/s which equals 1.3s
return to top



























Answer 3
2.6s

INCORRECT

You might have had the right answer of 1.3s you just doubled it. return to top


























Answer 4
3.9s

INCORRECT

You might have had the right answer until you multiplied it by 3 return to top


























What's this question really asking?

How do you find time it takes light to travel a distance of 3.9 x 108m? return to top

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