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The mass of a dust particle is $5 \times 1 0^{- 9}$ kg. Which of the following correctly expresses this mass as an ordinary decimal number?

Class 8Exponents and PowersExponents and Powers

A0.000000005 kg
B0.00000005 kg
C0.0000000005 kg
D0.000000050 kg

Step-by-Step Solution

5 \times 1 0^{- 9}

means moving the decimal 9 places left from 5, giving 0.000000005 kg.

Answer: A) 0.000000005 kg

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