Which of the following expressions is written in scientific notation? a) 0.2 × 10 -5 b) 31.4 × 10 4 c) 13 × 10 4 d) 1 × 10 -3

Scientific notation = N x 10^a

where N is a number between 1 and 10, but not 10 itself, and a is an integer (it can be positive or negative number).

In this case 1 × 10^-3 (N = 1 and a = -3)

Answer

D) 1 × 10^-3

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