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#nuclear decay

3 public questions tagged with this topic.

EM Wave Characteristics - Transverse Nature and E/B Ratio

Gamma rays are produced by which of the following processes?

**EM wave in vacuum** transverse, E and B perpendicular to propagation and to each other, E×B along propagation, in phase, E/B = c =3×10⁸ m/s, c =1/√(μ₀ ε₀), μ₀=4π×10⁻⁷ H/m, ε₀=8.85×10⁻¹² F/m. For E₀=45 V/m, B₀=E₀/c=45/3×10⁸=1.5×10⁻⁷ T=150 nT, illustrating B much smaller than E. Gamma rays are produced in nuclear reactions and emitted by radioactive nuclei, as per the document. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Radioactive decay of the nucleus, illustrating EM wave transverse nature and Maxwell's displacement current concept.

Ref: NCERT > Physics Book > Electromagnetic Waves > EM Wave Characteristics - Transverse Nature and E/B Ratio

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Displacement Current and Ampere-Maxwell Law

Which type of electromagnetic waves are produced by radioactive decay of the nucleus?

**Ampere-Maxwell law** ∮ B·dl = μ₀(I_c + ε₀ dΦ_E/dt) generalizes Ampere's law, displacement current arises from time-varying electric field, source of magnetic field like conduction current. For rate of change of flux 2×10¹¹ V·m/s, I_d = ε₀×2×10¹¹ =8.85×10⁻¹²×2×10¹¹=1.77 A. The document states that gamma rays are produced in nuclear reactions and emitted by radioactive nuclei. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Gamma rays, illustrating EM wave transverse nature and Maxwell's displacement current concept.

Ref: NCERT > Physics Book > Electromagnetic Waves > Displacement Current and Ampere-Maxwell Law

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Radioisopes and Field Biology methods

Which decay results in decrease in atomic number by 2 and mass number by 4?

Alpha decay ejects a helium-4 nucleus containing two protons and two neutrons. Parent nucleus therefore loses atomic number by two, shifting element position in periodic table, and mass number by four, reflecting loss of four nucleons. This contrasts with beta decay, where mass number remains unchanged and atomic number changes by one, and gamma decay where neither changes. Alpha emission is common in heavy unstable nuclei seeking stability and produces daughter nuclei with significantly lower mass, readily identifiable by alpha spectroscopy and mass balance.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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