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CBSE Class 12-science Answered

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Asked by merinlijo_20002 | 17 Jun, 2020, 10:05: AM
answered-by-expert Expert Answer
The half life of At-215 is 100 microseconds.The activity of sample if it contains 215mg initially is
A c t i v i t y equals fraction numerator 0.693 N over denominator t subscript begin display style bevelled 1 half end style end subscript end fraction F i r s t space w e space h a v e space t o space c a l c u l a t e space t h e space N N equals fraction numerator 215 cross times 10 to the power of negative 3 end exponent over denominator 215 g divided by m o l end fraction cross times 6.02 cross times 10 to the power of 23 N equals 6.02 cross times 10 to the power of 20 A c t i v i t y equals fraction numerator 0.693 cross times 6.02 cross times 10 to the power of 20 over denominator 100 cross times 10 to the power of negative 6 end exponent end fraction A c t i v i t y equals fraction numerator 0.693 cross times 6.02 cross times 10 to the power of 20 over denominator 100 cross times 10 to the power of negative 6 end exponent end fraction A c t i v i t y equals 4.18 cross times 10 to the power of 24
Answered by Utkarsh Lokhande | 17 Jun, 2020, 11:02: AM

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CBSE 12-science - Physics
55Cs124(Z=55,A=124) has a half life of 30.8s. (a) If we have 7.8 microgram initially, how many nuclei are presents? How many are present 2 min later? (b) What is the activity at this time? (c) After how much time will the activity drop to less than about 1 per second?
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CBSE 12-science - Physics
how are we supposed to solve this question
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Asked by merinlijo_20002 | 17 Jun, 2020, 10:05: AM
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CBSE 12-science - Physics
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Asked by alanpeter9611 | 23 Feb, 2019, 07:47: PM
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Asked by alanpeter9611 | 22 Feb, 2019, 11:24: PM
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CBSE 12-science - Physics
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CBSE 12-science - Physics
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Asked by silladech | 16 Nov, 2018, 11:14: AM
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CBSE 12-science - Physics
The half life period of a radioactive substance is 30 days. What is the time for ¾ th of its original mass to disintegrate?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Physics
How many α and β-partiles are emitted 90Th232 changes to 82Pb208?
Asked by Topperlearning User | 09 Jul, 2014, 04:06: PM
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CBSE 12-science - Physics
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