(a) State the law of radioactive decay. Write the SI unit of 'activity'.(b) There are 42×106 radioactive nuclei in a given radioactive sample. If the half life of the sample is 20 s, how many nuclei will decay in 10 s ?

Get 2 FREE Instant-Explanations on Filo with code FILOAPP

Home

Class 12

Physics

Nuclei

Nuclear Physics and Radioactivity

(a) State the law of radioactive decay. Write the SI unit of '

Question

Easy

Solving time: 2 mins

(a) State the law of radioactive decay. Write the SI unit of 'activity'.
(b) There are $42 \times 1 0^{6}$ radioactive nuclei in a given radioactive sample. If the half life of the sample is $20 s$ , how many nuclei will decay in $10 s$ ?

Views: 5,833 students

Exam:

Class 12th Board 2017

Found 7 tutors discussing this question

Samuel Discussed

(a) State the law of radioactive decay. Write the SI unit of 'activity'.
(b) There are

42 \times 1 0^{6}

radioactive nuclei in a given radioactive sample. If the half life of the sample is

20 s

, how many nuclei will decay in

10 s

10 mins ago

Discuss this question LIVE

10 mins ago

Text solutionVerified

(a) Statement : Rate of decay of a given radioactive sample is directly proportional to the total number of undecayed nuclei present in the sample.
Unit- becquerel(Bq)

(b) n \Rightarrow = N = N_{0} e^{- λ t} / \frac{N}{N _{0}} = (\frac{1}{2})^{n} = \frac{t}{T _{1/2}} = \frac{10}{20} = \frac{1}{2} N = 42 \times 1 0^{6} \times (\frac{1}{2})^{1/2} 4 \times 1 0^{6} nuclei

Was this solution helpful?

Report

One destination for complete JEE/NEET preparation

One destination to cover all your homework and assignment needs

Learn Practice Revision Succeed

Instant 1:1 help, 24x7

60, 000+ Expert tutors

Textbook solutions

Big idea maths, McGraw-Hill Education etc

Essay review

Get expert feedback on your essay

Schedule classes

High dosage tutoring from Dedicated 3 experts

Trusted by 4 million+ students

Stuck on the question or explanation?

Connect with our Physics tutors online and get step by step solution of this question.

231 students are taking LIVE classes

Question Text	(a) State the law of radioactive decay. Write the SI unit of 'activity'. (b) There are $42 \times 1 0^{6}$ radioactive nuclei in a given radioactive sample. If the half life of the sample is $20 s$ , how many nuclei will decay in $10 s$ ?
Topic	Nuclei
Subject	Physics
Class	Class 12
Answer Type	Text solution:1
Upvotes	54

(a) State the law of radioactive decay. Write the SI unit of 'activity'.
(b) There are $42 \times 1 0^{6}$ radioactive nuclei in a given radioactive sample. If the half life of the sample is $20 s$ , how many nuclei will decay in $10 s$ ?

Text solutionVerified

Questions from Class 12th Board 2017 - PYQs

Practice questions from Nuclei in the same exam

Practice more questions from Nuclei

Practice questions on similar concepts asked by Filo students

(a) State the law of radioactive decay. Write the SI unit of 'activity'.(b) There are 42​×106 radioactive nuclei in a given radioactive sample. If the half life of the sample is 20 s, how many nuclei will decay in 10 s ?

Text solutionVerified

Questions from Class 12th Board 2017 - PYQs

Practice questions from Nuclei in the same exam

Practice more questions from Nuclei

Practice questions on similar concepts asked by Filo students

Related books for questions on Nuclei

Previous year question papers

(a) State the law of radioactive decay. Write the SI unit of 'activity'.
(b) There are $42 \times 1 0^{6}$ radioactive nuclei in a given radioactive sample. If the half life of the sample is $20 s$ , how many nuclei will decay in $10 s$ ?