Practice question

**Hertz experiment** produced radio waves using spark gap LC oscillator, detected with loop antenna, confirming Maxwell's prediction, frequency ≈10⁸ Hz, wavelength ≈3 m, demonstrating EM waves travel at c, transverse, can be reflected, refracted, polarized. The document mentions that microwaves range from 0.1 m to 1 mm , and domestic microwave ovens typically use wavelengths around a few centimeters within this range. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields 0.1 m to 1 mm, illustrating EM wave transverse nature and Maxwell's displacement current concept.