Practice question

**Production of EM waves** requires accelerated charge, oscillating LC circuit produces changing E and B, antenna radiates when charge accelerates, frequency determined by L and C, f=1/(2π√(LC)). Hertz used spark gap with inductor and capacitor, produced ~10⁸ Hz radio waves, detected with loop, confirmed transverse nature, reflection, refraction, polarization, speed c. Electromagnetic waves transfer energy via oscillating electric and magnetic fields without a medium, while mechanical waves require a medium and transfer energy through particle vibrations. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields No medium for electromagnetic waves, illustrating EM wave transverse nature and Maxwell's displacement current concept.