Which of the following coloured light has the highest energy?

Fill in the blank: Wave number is measured in units of .........

What is the wavenumber of a radiation having a wavelength of $0.25 \mu m$?

Which of the following is $NOT$ a property of $X$-rays?

Which of the following series correctly represents the energy of the radiation?

The wavelength (in $\mathring{A}$) of a photon having energy $3 \ eV$ is approximately.
$1 \ eV = 1.6 \times 10^{-12} \ erg$
$h = 6.626 \times 10^{-27} \ erg \ s$
$c = 3 \times 10^{10} \ cm/s$