Why ozone hole forms over Antarctia? How will enhanced ultraviolet radiation affect us?

Ozone in the stratosphere is produced by the help of ultraviolet radiations. It protects us from harmful ultraviolet radiations. a) Write equation for the formation of ozone in stratosphere.

Light meters in photographic cameras make use of photoelectric effect. Red light however bright, cannot produce the emission of photoelectrons from a clean zinc sur face. But even a weak ultraviolet radiation can do. Do you agree with statement ? Why?

Ozone acts as a shield for absorbing ultraviolet radiations from the sun. Write the unit used to measure ozone layer.

Ozone acts as a shield for absorbing ultraviolet radiations from the sun. Name the region of atmosphere where ozone is seen.