Question

A scientist observed a bacterium in a microscope. It measured about 0.0000029 meter in diameter. Which of the following is closest to 0.0000029?

A.
2×10−6
B.
2×10−5
C.
3×10−5
D.
3×10−6

Answer 1

Answer: A.
`2*10^(-6)`.

Explanation:

Given: The diameter of bacterium = 0.0000029 meter

≈ 0.000002 meter [ with 6 decimal places]

`=(2)/(1000000)=(2)/(10^6)`

`=2*10^(-6)` meters [
`(1)/(a^n)=a^(-n)`]

i.e.
`2*10^(-6)` closest to 0.0000029.

Hence, the correct option is A.
`2*10^(-6)`.