Snakes can detect which type of waves?

What is called as the electromagnetic spectrum?

The frequency order for $\gamma$-rays $(a)$,$X$-rays $(b)$,and $UV$-rays $(c)$ is given as:

The wavelength $21 \ cm$ emitted by atomic hydrogen in interstellar space belongs to

The waves used in telecommunication are

If microwaves,$X$ rays,infrared,gamma rays,ultraviolet,radio waves and visible parts of the electromagnetic spectrum are denoted by $M, X, I, G, U, R$ and $V$ respectively,then which of the following is the arrangement in ascending order of wavelength?