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 [ Return to question menu ] 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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