Practice question

**X-rays and gamma rays in medicine** X-rays imaging because bone absorbs more than tissue, contrast, CT scan uses multiple X-ray projections, gamma knife uses focused gamma rays to destroy tumor with minimal surrounding damage, illustrating high-energy EM wave medical use. The document mentions that TV waves range from 54 MHz to 890 MHz . Using λ = (c/v) , this corresponds to wavelengths from about 0.34 m to 5.56 m . A simpler range based on frequency is used here. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Corresponding to 54 MHz to 890