A nanometre is equal to

Answer: Option B

"Nano" is a prefix that means one billionth (1/1,000,000,000).

A nanometer (nm) is therefore one billionth of a meter.

We know that 1 meter (m) = 100 centimeters (cm).

So,

1 nanometer (nm) = (1/1,000,000,000) meter = (1/1,000,000,000) × 100 cm

This simplifies to:

1 nm = 100 / 1,000,000,000 cm = 1 / 10,000,000 cm

In scientific notation:

1 / 10,000,000 = 10⁻⁷

Therefore, 1 nanometer = 10⁻⁷ cm.

✔ Correct Answer: Option B – 10⁻⁷ cm