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A Laser Beam Takes 100 Ms to Be Reflected Back

Question 17

Multiple Choice

A laser beam takes 100 ms to be reflected back from a totally reflecting sail on a spacecraft.How far away is the sail?

A) 1.5 * 10⁷ m
B) 3.0 * 10⁷ m
C) 4.5 * 10⁷ m
D) 6.0 * 10⁷ m

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