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please answer this

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Asked by Prashant DIGHE 14th January 2020, 10:12 PM
Answered by Expert
Answer:
From figure we see half life period ( time taken from initial 100 cpm to 50 cpm ) = 3 hour
 
( cpm :- counts per minute )
 
Total counts ia area under part of the curve curve DC . This area ABCD is approximately trapezium
 
area or Total count = (1/2) ( AD + BC ) AB = (1/2) ( 150 ) 3 = 225
 
Hence answer (3) 3 hour , 235 counts
Answered by Expert 15th January 2020, 8:19 AM
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