Question

Which of the following electromagnetic radiations have the longest wavelength?

• A. $X$-rays
• B. $\gamma$-rays
• C. Microwaves
• D. Radiowaves

Answer 1

The correct option is D Radiowaves

Radiation Wavelength (range in $m$)
$X$-rays $1\times {10}^{-11}to3\times {10}^{-8}$
$\gamma$-rays $6\times {10}^{-14}to1\times {10}^{-11}$
Microwaves ${10}^{-3}to0.3$
Radiowaves $10to{10}^4$