Draw and label an energy level diagram for the hydrogen atom. In your diagram show how the series of lines in the ultraviolet and visible regions of its emission spectrum are produced, clearly labelling each series.

List the following types of electromagnetic radiation in order of increasing wavelength (shortest first).

I. Yellow light

II. Red light

III. Infrared radiation

IV. Ultraviolet radiation.

The thinning of the ozone layer increases the amount of $\mathrm{UV}-\mathrm{B}$ radiation that reaches the earth's surface.

Based on the information in table, explain why $\mathrm{UV}-\mathrm{B}$ rays are more dangerous than $\mathrm{UV}-\mathrm{A}$.