Questions
A sample of radioactive element contains active nuclei. If half life of element is 10 days, then the number of decayed nuclei after 40 days is
detailed solution
Correct option is B
Number of half lives =n=tT12=4010=4 Decay Law, NN0=12n ⇒N=N012n ⇒N=5×1010×124=5×101016=0.3125×1010 Thus, number of nuclei decayed after 40 days=N0−N= 5×1010−0.3125×1010=4.6875×1010Talk to our academic expert!
Similar Questions
The disintegration rate of a certain radioactive sample at any instant is 4750 disintegrations per minute. 5 min later, the rate becomes 2700 min-1. Then, the half-life of the sample (in min) is……..
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
free study material
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests
