Which of the following coloured light has the highest energy?

What is a black body?

The wavelength range of the visible spectrum extends from violet $(400 \, nm)$ to red $(750 \, nm).$ Express these wavelengths in frequencies $(Hz).$ $(1 \, nm = 10^{-9} \, m)$

If the energies of two photons are in the ratio of $3:2$,their wavelengths will be in the ratio of

Which one of the following frequencies of radiation (in $Hz$) has a wavelength of $600 \ nm$?

State the characteristics and uses of $X$-rays.