Class 12 ISC Physics Radioactivity Board Questions
Here we provide Class 12 Physics important notes,board questions and predicted questions with Answers for chapter Radioactivity. These important notes,board questions and predicted questions are based on ISC board curriculum and correspond to the most recent Class 12 Physics syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations as well as other entrance exams such as NEET and JEE.
Q1
Half life of a certain radioactive material is 8 hrs.
(i) Find disintegration constant of this material.
(ii) If one starts with 600 g of this substance, how much of it will disintegrate in one day?
solutions
(i) Find disintegration constant of this material.
(ii) If one starts with 600 g of this substance, how much of it will disintegrate in one day?
solutions
Q2
The half life of a radium is 1550 years. Calculate its disintegration constant.
solutions
solutions
Q3
Copy and complete the following table for a radioactive element whose half life is 10 minutes.
Assume that you have a 30 g of this element at t = 0
solutions
solutions
Q4
Radioactive substance decays to 1/16th of its initial mass in 40 days. The half life of the
substance in days is:
(a) 20
(b) 10
(c) 5
(d) 2.5
solutions
(a) 20
(b) 10
(c) 5
(d) 2.5
solutions
Q5
Obtain a relation between half life of a radioactive substance and decay constant (λ).
solutions
Decay constant explains the rate at which the nucleus will disintegrate.
solutions
Decay constant explains the rate at which the nucleus will disintegrate.
It's S.I unit is s-1
The relation between half-life of a radioactive substance and decay constant is given by
T=0.693/λ
Q6
What is meant by the term half life of a radioactive substance in binding energy of a nucleus?
solutions
solutions
The half-life of the element is t1/2=0.693/λ
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