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. $2\times10^{-6}$.

Step-by-step explanation:

Given: The diameter of bacterium = 0.0000029 meter

≈  0.000002 meter  [ with 6 decimal places]

$=\dfrac{2}{1000000}=\dfrac{2}{10^6}$

$=2\times10^{-6}$ meters    [$\dfrac{1}{a^n}=a^{-n}$]

i.e. $2\times10^{-6}$ closest to 0.0000029.

Hence, the correct option is A. $2\times10^{-6}$.