According to the electromagnetic theory of Maxwell,what happens when charged particles are accelerated?

The radiation is emitted when a hydrogen atom goes from a high energy state to a lower energy state. The wavelength of one line in the visible region of the atomic spectrum of hydrogen is $6.5 \times 10^{-7} \, m$. The energy difference between the two states is:

In the visible spectrum,which color,violet or red,undergoes greater refraction? Why?

The energy of electromagnetic radiation depends on:

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

What is scattering? Which property of electromagnetic radiation can explain it? Explain.