A Laser Beam Is Reflected Back from a Totally Reflecting

question 72

Multiple Choice

A laser beam is reflected back from a totally reflecting sail on a spacecraft that is 4.5 * 10⁷ m from the source of the beam.How long after the beam is sent does it return to the source?

• A)100 ms
• B)200 ms
• C)150 ms
• D)300 ms

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