Question

4 metre length contains – NM​

Answer 1

Answer:

$4 \times {10}^{ 9}$

is the answer

hope this helps you

Answer 2

1 meter is equal to 1,000,000,000 nano meter.

which means 4 meter = 4x1,000,000,000 nano meters

Therefore answer to given question is 4,000,000,000 nanometers