Approximately how long does it take light to travel from the fingertips of a person's extended arm to one's eye? A) zero time because light is transmitted instantaneously B) 2.5 trillionths of a second (2.5 × 10^-12 sec) C) 2.5 billionths of a second (2.5 nanoseconds) D) 2.5 millionths of a second (2.5 microseconds)

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Quizplus · Accepted Answer

The average distance from a person's fingertips to their eyes is about 1 meter. Light travels at approximately 299,792,458 meters per second, so it takes about 3.3 nanoseconds to travel 1 meter, making 2.5 nanoseconds a reasonable approximation.

Approximately How Long Does It Take Light to Travel from the Fingertips