Give FOUR possible reasons why your actual yield is less than the theoretical yield. You canmention mechanical, losses, but if you do you have to be specific about exactly where the mechanicallosses might be, and mechanical losses can only be TWO of your FOUR possible reasons.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

particle   p is an electron and particle q is a neutron