Explanation:
: As we know, frequency and wavelength has the inverse relation. It means that rays which has more wavelength has minimum frequency and vice-versa.
Decreasing order of wavelength,
\(\lambda_{\text {microwave }}>\lambda_{\text {infared rays }}>\lambda_{\text {U.V.rays }}>\lambda_{\text {X-rays }}\)
We know,
\(\mathrm{v}=\mathrm{f} \times \lambda\)
\(\mathrm{f}=\frac{\mathrm{v}}{\lambda}\)
So, increasing order of frequency -
\(\mathrm{f}_{\mathrm{X} \text { - rays }}>\mathrm{f}_{\mathrm{U}, \mathrm{V} \text {,rays }}>\mathrm{f}_{\text {infrared rays }}>\mathrm{f}_{\text {microwave }}\)Hence, microwave among them has low frequency.
