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#nuclear processes

2 public questions tagged with this topic.

Nuclear Reactions - Fission, Fusion and Energy Release

Which process cannot produce elements beyond the peak of the binding energy curve?

**Nuclear fusion** source of energy in Sun, proton-proton cycle 4p→He+2e⁺+2ν+26.7 MeV, high temperature ~10⁷ K needed to give kinetic energy to overcome repulsion, thermal motion at high T allows tunneling, energy release because He BE/A higher than H. Fission releases energy because heavy nucleus BE/A ~7.6 MeV splits to intermediate ~8.5 MeV. Fusion produces heavier nuclei with higher binding energy per nucleon up to the peak (around A = 56), but beyond this, further fusion does not release energy, limiting element synthesis. Using E_n = -13.6/n² eV, r_n = n² a₀, L = n h/2π, R = R₀ A^¹/³, BE

Ref: NCERT > Physics Book > Atoms and Nuclei > Nuclear Reactions - Fission, Fusion and Energy Release

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Ultraviolet, X-rays, Gamma Rays and Their Properties

In the electromagnetic spectrum, why are gamma rays associated with nuclear processes?

**X-rays in medicine** treat certain cancers because high-energy photons ionize and damage DNA of malignant cells, also imaging because bones absorb more than tissue, contrast. Gamma rays from Co-60 used for radiotherapy, energy ≈1.17 and 1.33 MeV, highly penetrating. Gamma rays are produced by high-energy nuclear transitions or radioactive decay, as their extremely short wavelengths correspond to the energy scales of nuclear phenomena. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Nuclear energy scales, illustrating EM wave transverse nature

Ref: NCERT > Physics Book > Electromagnetic Waves > Ultraviolet, X-rays, Gamma Rays and Their Properties

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