What is the frequency of the photons emitted by hydrogen atoms when they undergo transition from n=5 to n=3

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.

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)