Question

3 the width of a dna molecule is about 2.5 nanometers. a nanometer is 0.000000001 meter. write the width of a dna molecule in scientific notation. show your work. the width of a dna molecule is ____________ meter.

Explanation:

Step1: Recall scientific - notation form

Scientific notation is $a\times10^{n}$, where $1\leqslant|a|\lt10$ and $n$ is an integer.

Step2: Convert 2.5 nanometers to meters

Since 1 nanometer = $0.000000001$ meter = $1\times10^{- 9}$ meter, then 2.5 nanometers = $2.5\times0.000000001$ meter.

Step3: Calculate the value in scientific notation

$2.5\times0.000000001=2.5\times10^{-9}$ meter.

Answer:

$2.5\times10^{-9}$