# math

The diameter of a hydrogen atom is about 5×10^-11 meter. Suppose 8.4×10^8 hydrogen atoms were arranged side by side in a straight line. Multiply these numbers to find the length of this line of atoms. What is the length in scientific notation?

42×10^−3 meter

0.042 meter

4.2×10^−2 meter

4.2×10^−3 meter

1. 👍
2. 👎
3. 👁
1. 1. 0.042
2. 0.042
3. 0.0042

I have no idea how that works. i used cymath . com to get the answer.

Nice multiplication and minus signs by the way.

1. 👍
2. 👎
2. A hydrogen atom's diameter in metres is
5.3×10
−11
m
.

How many hydrogen atoms could fit in a line of
0.047metres?

1. 👍
2. 👎

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