Electromagnetic radiation that is emitted from a nucleus is in the form of:
Cherenkov radiation
Gamma rays
Ultraviolet light
Microwaves
Gamma rays are the form of electromagnetic radiation emitted directly from an atomic nucleus, typically during radioactive decay processes like alpha or beta decay, where the nucleus releases high-energy photons to achieve stability.
Option Analysis
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Cherenkov radiation: This occurs when charged particles, such as electrons from beta decay, travel faster than light’s phase velocity in a medium like water, producing a blue shockwave-like glow; it is not emitted from the nucleus itself but from particle-medium interactions.
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Gamma rays: High-energy photons (shortest wavelength, >10^19 Hz) originate directly from excited nuclear states post-decay, penetrating deeply due to their ionizing nature.
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Ultraviolet light: UV rays arise from atomic electron transitions, not nuclear processes, with energies too low (3-124 eV) for nuclear excitation.
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Microwaves: These low-energy waves (long wavelengths) come from molecular rotations or electronic circuits, unrelated to nuclear emission.
Nuclear Emission Mechanism
Nuclei emit gamma rays when dropping from high to low energy states, as seen in isomeric transitions or after alpha/beta decay; photon energy often exceeds 100 keV, distinguishing them from other EM types. This contrasts with Cherenkov radiation, visible in nuclear reactors as secondary blue light from beta particles in coolant. For CSIR NET aspirants, note gamma rays’ role in spectroscopy for nuclear identification.
