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Question: Answered & Verified by Expert
A radioactive sample of half-life 10 days, contains 1000x nuclei. Number of original nuclei present after 5 days is
PhysicsNuclear PhysicsJEE Main
Options:
  • A 707x
  • B 750x 
  • C 500x 
  • D 250x 
Solution:
1499 Upvotes Verified Answer
The correct answer is: 707x
The number of radioactive nuclei left after n half lives is

N=N02n


for 5 days n=12

So, N=1000x212=1000x2

=1000x1.414=0.7071000x

=707x

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