Unit: Waves
Year: 1989 Question#: 47
Question: The time required for light to travel a distance of 1.5 X 1011 meters is closest to
(1 ) 5.0 X 102s
(2 ) 2.0 X 10-3s
(3 ) 5.0 X 10-1s
(4 ) 4.5 X 1019s
What is this question really asking?
Explanation by: Melissa H.
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Answer 1
5.0 X 102s
Correct
This answer is correct because the equation
has been applied correctly.
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Answer 2
2.0 X 10-3s
Incorrect
This answer is incorrect because the time is way too fast. The distance is much greater than 300,000,000 m (the distance light travels in a second) so there is no way to cover that distance in less than 1 second. return to top
Answer 3
5.0 X 10-1 s
Incorrect
This answer is incorrect because the time is way too fast. The distance is much greater than 300,000,000 m (the distance light travels in a second) so there is no way to cover that distance in less than 1 second. return to top
Answer 4
4.5 X 1019 s
Incorrect
This answer is incorrect because the time is way too long for this distance. Try using
return to top What's this question really asking?
This question is really asking how to calculate how much time it takes light waves travel a certain distance. return to top
