#2.what are the corresponding elements corresponding to 232^X(Z=92); 18^X(Z=7);
ID: 2122575 • Letter: #
Question
#2.what are the corresponding elements corresponding to 232^X(Z=92); 18^X(Z=7); 1^X(Z=1); 82^X(Z=38). #3.(a) In 2 Half-Lives the activity of a radioactive sample will be decreased to what percent?(b) the half-life of a radioactive sample isotope is 23.45min. What fraction of the sample will be left after 70.35 min? (c) A sample of radioactive Francium-104 (223^Fr (Z=87)) has a half life of 22.00min. Estimate what fraction of radioactive Fr is left after 1 h. (d) What period of time is required for a sample of radioactive polonium to lose 80% of its activity? (T1/2= 138.376 days)
Explanation / Answer
3(a) At the end of the 2nd half-life the activity will be (1/2 )^2
=1/4 of the original activity
The decrease in activity = 1 %u2013 1/4 = 3/4 = 75%
3(b)halflife = 23.45 min
required for 73.45
so fraction is 1-1/8 = 7/8
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