Practice question

**Ozone layer depletion** environmental concern related to increased UV-B reaching surface, causing skin cancer, cataracts, damage to crops and marine life, due to CFCs releasing Cl that catalytically destroys O₃, O₃ absorbs UV 200-320 nm, depletion increases UV transmission. The document states that the sun is an important source of ultraviolet light, though much of it is absorbed by the ozone layer. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields The sun, illustrating EM wave transverse nature and Maxwell's displacement current concept.