What is an ozone hole?

$(i)$ The wavelength of microwaves is greater than that of $UV$-rays.
$(ii)$ The wavelength of $IR$ rays is less than that of $UV$-rays.
$(iii)$ The wavelength of microwaves is lesser than that of $IR$ rays.
$(iv)$ Gamma rays have the shortest wavelength in the electromagnetic spectrum.
Of the above statements:

The range of wavelength for ultraviolet is from . . . . . . .

The frequency range from $3 \times 10^9 \, Hz$ to $3 \times 10^{10} \, Hz$ is known as:

$X$-rays and gamma rays are both electromagnetic waves. Which of the following statements is true?

What is the approximate wavelength range of the electromagnetic spectrum?