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At time t=0, number of nuclei of a radioactive substance are 1
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At time , number of nuclei of a radioactive substance are 100. At these numbers become 90. Find the number of nuclei at .

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Optics And Modern Physics (DC Pandey)

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At time , number of nuclei of a radioactive substance are 100. At these numbers become 90. Find the number of nuclei at .
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In 1 second, of the nuclei have remained undecayed, so in another 1 second of 90 , i.e. 81 nuclei will remain undecayed.
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Practice questions from Optics And Modern Physics (DC Pandey)

Question 1
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Nuclei of a radioactive element are being produced at a constant rate . The element has a decay constant . At time , there are nuclei of the element. (a) Calculate the number of nuclei of at time . (b) If , calculate the number of nuclei of after one half-life of , and also the limiting value of as .
Topic

Topic:

Nuclei

Book

Book:

Optics And Modern Physics (DC Pandey)

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Question 2
Medium
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Assertion : In a nuclear process energy is released if total binding energy of daughter nuclei is more than the total binding energy of parent nuclei. Reason : If energy is released then total mass of daughter nuclei is less than the total mass of parent nuclei.
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  2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. If Assertion is true, but the Reason is false.
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Optics And Modern Physics (DC Pandey)

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Question 4
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Book

Book:

Optics And Modern Physics (DC Pandey)

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Question Text
At time , number of nuclei of a radioactive substance are 100. At these numbers become 90. Find the number of nuclei at .
TopicNuclei
SubjectPhysics
ClassClass 12
Answer TypeText solution:1
Upvotes99