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Answers posted by mahaseth2016

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The half-life of a radioactive element is 100 years. What is its disintegration contant (in years$^{-1}$) ?
answered Feb 9, 2019
Option no A will apporpriate answer
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A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room ?
answered Feb 9, 2019
300days will be option no A
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A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (per minute) is :
answered Feb 9, 2019
A option will be correct
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The activity of a radioactive sample is measured as N0 counts per minute at t = 0 and N0/e counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is –
answered Feb 9, 2019
Option cwillcorrectanswer
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Half life of radioactive element is 12.5 Hour and its quantity is 256 gm. After how much time its quantity will remain 1 gm : -
answered Feb 9, 2019
50 hours will be option no B
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