Which of these time measurements is the smallest? A) 0.02 seconds. B) 0.02 teraseconds. C) 2,500 milliseconds. D) 25,000 nanoseconds

In order to answer the question, we convert the measurements given to a common base unit. For this case, we use seconds.

A) 0.02 seconds

B) 0.02 teraseconds x (10^12 s / 1 terasecond) = 2x10^10 seconds

C) 2,500 milliseconds x (1 s / 1000 ms) = 2.5 seconds

D) 25,000 nanoseconds x (1 x 10^-9 s / 1 nanosecond) = 2.5 x 10^-5 seconds

Therefore, among the choices listed above the correct answer is D.

To answer the question, convert all of these measurements to a common unit. I choose seconds as the basis.

(a) 0.02 seconds

(b) 0.02 teraseconds x (10^12 s / 1 terasecond) = 2x10^10 seconds

(c) 2,500 milliseconds x (1 s / 1000 ms) = 2.5 seconds

(d) 25,000 nanoseconds x (1 x 10^-9 s / 1 nanosecond) = 2.5 x 10^-5 seconds

The answer is letter D.