Class 12 Physics Radioactivity and Nuclear Reaction Notes and Important Questions
Learn
Loading notes…
Notes for Class 12 Radioactivity and Nuclear Reaction (Physics) are shown above.
Practice
Important Questions
Derive an expression for a radioactive process where the symbols carry their standard meanings.
A student measured the activity of a sample of radioactive rock. Her results are presented in the graph.
Explain why the data are scattered.
Determine the half-life of the sample
Define the term radioactivity.
Two radioactive samples A and B have equal number of atoms initially. Their half lives are 3 hours and 9 hours respectively. Compare their rate of disintegration after 18 hours from start
Develop a relation between half life and decay constant of a radioactive sample.
What percentage of atoms decayed after five half life periods? Justify your answer with calculation.
What percentage of original radioactive atoms is left after 4 half-lives?
$1%$
$6%$
$10%$
Define the terms half life and mean life of a radioactive substance.
If 2 gm of a radioactive material having half life period of 50 years disintegrates, find out mean life of the given sample.
Given figure represents decay graph of a radioactive sample of half life 10 years. Estimate the value of T₃.
Define one curie.
Obtain a relation between half life and decay constant.
The half-life of a radioactive isotope is 10 days. What is the percentage of the sample remaining after 25 days?
Define decay constant and half life.
Derive the equation: N = N₀e⁻λt for radioactive process where symbols have their usual meanings.
5 more questions locked
Upgrade to a paid plan to view all important questions
Exam
This chapter explores the spontaneous transformation of unstable atomic nuclei and the different types of nuclear radiation. Students study alpha, beta and gamma rays, radioactive decay, decay constant, half-life and mean life. It also covers the Geiger-Muller tube, carbon dating, medical applications of radiation and the potential hazards of radioactive exposure.
This page covers Radioactivity and Nuclear Reaction, chapter 24 of 25 in the Class 12 Physics syllabus set by the National Examination Board (NEB). 9 important questions for this chapter are available, each with a full solution.
For numerical and derivation-based chapters like this one, working through past NEB questions is usually more useful than re-reading notes alone — try solving each important question above before checking the solution, then compare your working step by step.