Question

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.

Answer 1

Hey there!!

Scientific notation of 0.000000001 :

0.1 ⁻⁷

Hope it helps!

Answer 2

Answer: $2.5 \times 10^{-9}$

Step-by-step explanation:

Given : The width of a DNA molecule = 2.5 nanometers.

A nanometer = 0.000000001 meter.

In scientific notation it will be

A nanometer = $=\dfrac{1}{1000000000}=10^{-9}$ meter

⇒ 2.5 nanometers= $2.5 \times 10^{-9}$ meters

Therefore , the width of a DNA molecule =$2.5 \times 10^{-9}$

We use scientific notation to express a very big or a very small number in the product of a decimal  ( between 1 and 10) and powers of ten.