Nuclear Physics
Telangana Board · Class 12 · Physics
Most important questions from Nuclear Physics for Telangana Board Class 12 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.
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Sample Questions
Which of the following are characteristics of α-particles? (Select all correct answers)
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They are helium nuclei, They have high ionizing power, They consist of 2 protons and 2 neutrons
α-particles are helium nuclei (⁴₂He) with 2 protons and 2 neutrons, making them positively charged. They have high ionizing power but low penetrating power, being stopped by thin aluminum sheets.
The half-life of a radioactive substance is directly proportional to its decay constant.
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False
Half-life is inversely proportional to decay constant: T₁/₂ = 0.693/λ. As decay constant increases, half-life decreases.
In the nuclear reaction ¹⁴₇N + ⁴₂He → ¹⁷₈O + ¹₁H, what is conserved?
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Mass number, Atomic number, Charge, Energy
In nuclear reactions: Mass number (14+4=17+1=18), Atomic number (7+2=8+1=9), and Charge are conserved. Energy is also conserved. Number of neutrons may change.
Nuclear fission of ²³⁵U typically releases how much energy per fission?
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200 MeV
Nuclear fission of ²³⁵U releases approximately 200 MeV per fission event. This enormous energy comes from the mass defect when uranium splits into lighter fragments.
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