What happens in the photosystem 2 when it is hit by a photo of light

A pigment molecule in the photosystem absorbs one photon, a quantity or “packet” of light energy, at a time. ... To replace the electron in the chlorophyll, a molecule of water is split. This splitting releases an electron and results in the formation of oxygen (O2) and hydrogen ions (H+) in the thylakoid space.

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.