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

question 72

Multiple Choice

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)