The waves used in telecommunication are

Consider the following statements regarding the electromagnetic spectrum:
$(A)$ The wavelength of microwaves is greater than that of $UV$ rays.
$(B)$ The wavelength of $IR$ rays is less than that of $UV$ rays.
$(C)$ The wavelength of microwaves is lesser than that of $IR$ rays.
$(D)$ Gamma rays have the shortest wavelength in the electromagnetic spectrum.
Which of the above statements are true?

The frequency of a wave is $6 \times 10^{15} \text{ Hz}$. This wave is:

Which of the following is not an electromagnetic wave?

The device used to detect infrared radiations is

$TV$ waves have a wavelength range of $1-10 \, m$. Their frequency range in $MHz$ is