Questions
For a substance the average life for - emission is 1620 years and for -emission is 405 years. After how much time the 1/4 of the material remains after emission?
detailed solution
Correct option is C
λα=11620 per year and λβ=1405 per year and it is given that the fraction of the remained activity AA0=14Total decay constant λ=λα+λβ=11620+1405=1324per year We know that A=A0e-λt⇒t=1λlogeA0A⇒t=1λloge4=2λloge2=324 x 2 x 0.693 =449 years.Similar Questions
The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
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