The infra-red spectrum lies between:

Hint: We have an Electromagnetic spectrum in which the entire range of light exists. These lights are not affected by electric or magnetic fields. They travel with the speed of light i.e., $3 \times {10^8}m/s$. This spectrum consists of various light including infra-red which has a definite range wavelength and frequency.

Complete answer:
Different radiations have different ranges according to their velocity and energy. The radiation having high frequency has high energy and having high velocity has high wavelength. The spectrum starts from Gamma rays which have the highest energy among the radiation and ends upon radio waves. Infra-red lies between ultraviolet rays and radio waves.
Hence,
The wavelength range of infra-red is: $780nm$ to $1000nm(1mm)$
The frequency range of infra-red is: $300GHz$ to $400THz$
The wavelength range of infra-red is: $780nm$ to $1000nm(1mm)$
The frequency range of infra-red is: $300GHz$ to $400THz$.

Note: The electromagnetic spectrum wavelength range of all the radiations are given below:
Gamma rays: greater than ${10^{ - 12}}m$
X-rays: ${10^{ - 8}}$ to \[{10^{ - 12}}m\]
Ultraviolet rays: ${10^{ - 7}} - {10^{ - 8}}m$
Visible: $380nm - 750nm$
Infra-red rays:${10^{ - 6}} - {10^{ - 3}}m$
Microwaves:${10^{ - 3}} - {10^{ - 1}}m$
Radio waves: less than ${10^{ - 1}}m$