CUET · PHYSICS · PYQ PAPER 2025
In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following is emitted in the decay?
- A Proton
- B Neutron
- C Electron
- D Photon
Answer & Solution
Correct Answer
(D) Photon
Step-by-step Solution
Detailed explanation
This process is known as Gamma \((\gamma)\) decay, where an excited nucleus releases excess energy as high-energy photons to become stable. Since photons have no charge or mass, the atomic number ( \(Z)\) and mass number \((A)\) of the nucleus remain unchanged.
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