Question

Light of wavelength \(1\ \text{nm}\) belongs to the following class of waves

• A. Radio waves
• B. Microwaves
• C. X-rays
• D. Gamma rays

Hint:

A quick way to remember: \[ \text{X-rays} \approx 10^{-11}\text{ m to }10^{-8}\text{ m} \] and \[ \text{Gamma rays} \lt 10^{-11}\text{ m}. \] Since \(1\ \text{nm}=10^{-9}\ \text{m}\), it lies in the X-ray region.

Answer 1

The Correct Option is C

Step 1: Convert wavelength and identify spectrum.
\( \lambda = 1\text{ nm} = 1\times10^{-9}\text{ m} \).

Step 2: Match to EM spectrum.
X-rays span \( 0.01\text{ nm}\) to \( 10\text{ nm} \), which includes 1 nm. Gamma rays are below 0.01 nm; UV is 10–400 nm. So 1 nm falls in the X-ray region.

\[ \boxed{\text{X-rays}} \]