Question

Oxygen is converted to ozone by which wavelength of ultraviolet

Answer 1

an oxygen molecule is split (photolyzed) by higher frequency UV light (top end of UV-B, UV-C and above) into two oxygen atoms (see figure):
O2 + ℎν → 2 O•
Each oxygen atom then quickly combines with an oxygen molecule to form an ozone molecule:
O• + O2 → O3
The ozone–oxygen cycle: the ozone molecules formed by the reaction above absorb radiation having an appropriate wavelength between UV-C and UV-B. The triatomic ozone molecule becomes diatomic molecular oxygen plus a free oxygen atom (see figure):
O3 + ℎν(240–310 nm) → O2 + O
The atomic oxygen produced quickly reacts with another oxygen molecule to reform ozone:
O + O2 → O3 + EK
where EK denotes the excess energy of the reaction which is manifested as extra kinetic energy.

Answer 2

The only difference is that ozone is made up of three oxygen atoms, while the stuff we breathe (molecular oxygen) is made up of only two atoms. Solar rays high in the atmosphere convert O2 to O3. In the upper atmosphere, rays from the Sun break a normal oxygenmolecule into two separate oxygen atoms..

 An oxygen molecule is split (photolyzed) by higher frequency UV light (top end of UV-B, UV-C and above) into two oxygen atoms (see figure):

O2 + ℎν → 2 O•

Each oxygen atom then quickly combines with an oxygen molecule to form an ozone molecule:

O• + O2 → O3