Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • What is the activity in Curie () of 2 moles of an isotope of Plutonium for which mass number is 239

What is the activity in Curie (\mathrm{Ci}) of 2 moles of an isotope of Plutonium for which mass number is 239 and half -life is 26000 yrs?

Option: 1

1.49\, \mathrm{Ci}


Option: 2

5.513 \times 10^{11} \mathrm{Ci}


Option: 3

14.9 \mathrm{Ci}


Option: 4

27.5 \mathrm{Ci}


Answers (1)

best_answer

\mathrm{\because-\frac{d N}{d t}=\lambda N \Rightarrow \frac{0.693}{t_{1 / 2}} \times n \times N_{A} }

\mathrm{-\frac{d N}{d t}=\frac{0.693 \times 2 \times 6.022 \times 10^{23}}{26000 \times 365 \times 60 \times 60 \times 24} }

\mathrm{\because 3.7 \times 10^{10} \mathrm{dps}=1 \text { Curie } }

\mathrm{\therefore-\frac{d N}{d t}=101.79 \times 10^{10} \mathrm{dps}=27.5 \text { Curie }}

Posted by

shivangi.bhatnagar

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Latest Question