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Practice question

MCQ

Question

Why are gamma rays used in sterilization of medical equipment?

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Explanation

**Poynting vector** S = E×B/μ₀ gives energy flow (W/m²), magnitude S = E B/μ₀, average = E₀ B₀/(2μ₀) = intensity, direction of propagation, showing energy transport perpendicular to E and B. Gamma rays penetrate deeply and have high energy, enabling them to kill bacteria and pathogens effectively without leaving chemical residues, ideal for sterilizing medical equipment. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Deep penetration, illustrating EM wave transverse nature and Maxwell's displacement current concept.

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