CUET · PHYSICS · PYQ PAPER 2025
The mass defect (\( \Delta M \)) for a nucleus of mass number (A), atomic number (Z) and mass (M) is given by:
- A \( \Delta M = [Z m_p + (A - Z) m_n] - M \)
- B \( \Delta M = [Z m_p + (A - Z) m_n] + M \)
- C \( \Delta M = [Z m_p + (A - Z) m_e] - M \)
- D \( \Delta M = [Z m_p + (A - Z) m_n] - M \)
Answer & Solution
Correct Answer
(A) \( \Delta M = [Z m_p + (A - Z) m_n] - M \)
Step-by-step Solution
Detailed explanation
Mass defect is the difference between the total mass of the individual nucleons (protons and neutrons) and the actual mass of the nucleus ( \(M\) ). Since a nucleus has \(Z\) protons and ( \(A-Z\) ) neutrons, the sum of their individual masses is…
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