Practice question

**IR effectiveness in remote sensing** because IR scattered less than visible by atmosphere, can detect heat signatures, used in satellite imaging for vegetation, moisture, military night vision, illustrating application based on thermal emission and low scattering. The document states that visible light ranges from about 700 nm to 400 nm . Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields 700 nm to 400 nm, illustrating EM wave transverse nature and Maxwell's displacement current concept.