Answer :

In beta decay, a neutron decays into a proton, an electron and an antineutrino.


n(neutrino) e-(electron) + e+(proton) + 𝜈+(antineutrino)


Example:


6C8(Carbon) 7N7(Nitrogen) + e-(electron) + 𝜈+(antineutrino)


The radioactive decay law is given by N = N0e-λt, where N = final number of particles, N0 = initial number of particles, λ = decay constant, t = time.


Now, , where t1/2 = half life.


In this problem, t1/2 = 12.5 yr


Therefore,


Hence, after a time t = 25 years,


Fraction remaining undecayed = (Ans)


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

A. A radioactive Physics - Board Papers

Nuclei with magicPhysics - Exemplar

The activity R ofPhysics - Exemplar

Define the term ‘Physics - Board Papers

(a) Write the relPhysics - Board Papers

<span lang="EN-USHC Verma - Concepts of Physics Part 2

Sometimes a radioPhysics - Exemplar

Which sample, A oPhysics - Exemplar