If $\lambda_{v}, \lambda_{x}$ and $\lambda_{m}$ represent the wavelengths of visible light, X-rays and microwaves respectively, then:

$\lambda_{m}>\lambda_{x}>\lambda_{v}$ $\lambda_{v}>\lambda_{m}>\lambda_{x}$ $\lambda_{v}>\lambda_{x}>\lambda_{m}$ $\lambda_{m}>\lambda_{v}>\lambda_{x}$

$\lambda_{m}>\lambda_{v}>\lambda_{x}$

As wavelength range of microwaves is from 0.1 m to 1 mm, visible light is from 700 nm to 400 nm and X-rays is from 1 nm to 10-3 nm ∴  $\lambda_{m}>\lambda_{v}>\lambda_{x}$