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| 1. |
The radioactivity of given sample of whisky due to tritium (half life = 12 yrs) was found to be only 3.125% of that measured in a recently purchased bottle marked "10 yrs old". By how many years ago sample must have been prepared ? |
| Answer» <html><body><p>20 yrs<br/>30 yrs<br/>50 yrs<br/>70 yrs</p>Solution :`A/A_(0)=(1/2)^(t/T) rArr (3.125)/(<a href="https://interviewquestions.tuteehub.com/tag/100-263808" style="font-weight:bold;" target="_blank" title="Click to know more about 100">100</a>) =(1/2)^(t/T)` <br/> `rArr (1)/(32)=(1/2)^(t/T) rArr (1/2)^(5) =(1/2)^(t/T)` <br/> `t=5T =5 <a href="https://interviewquestions.tuteehub.com/tag/xx-747671" style="font-weight:bold;" target="_blank" title="Click to know more about XX">XX</a> 12=60yrs` <br/> <a href="https://interviewquestions.tuteehub.com/tag/total-711110" style="font-weight:bold;" target="_blank" title="Click to know more about TOTAL">TOTAL</a> <a href="https://interviewquestions.tuteehub.com/tag/age-851457" style="font-weight:bold;" target="_blank" title="Click to know more about AGE">AGE</a> of sample `=60+10=70yrs`</body></html> | |