Question

How do you write 7.4 nm in scientific notation?

Answer 1

`7.4*10^-9` m

Explanation:

One nano meter is 0.000000001 m or `1*10^-9` m.
So 7.4 nm is `7.4*10^-9` m

The following chart from http://imgkid.com/scientific-notation-examples-for-kids.shtml tells you how I went from 0.000000001 m to `1*10^-9` m :