The half-life of 222 Rn is 3.83 days. (a) Convert the half-life to seconds. (b)

Question

The half-life of 222Rn is 3.83 days.     (a) Convert the half-life to seconds.
                                    
    
    (b) Calculate the decay constant for this isotope.
          s?1
    
    (c) Convert 0.650

The half-life of 222Rn is 3.83 days. Convert the half-life to seconds. Calculate the decay constant for this isotope. s?1 Convert 0.650 mu Ci to the SI unit the becquerel. Bq Find the number of 222Rn nuclei necessary to produce a sample with an activity of 0.650 mu Ci. 222Rn nuclei Suppose the activity of a certain 222Rn sample is 6.60 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity at the end of that period.

Explanation / Answer

(a)T=3.83*24*60*60=330912 s

(b)decay constant L=ln 2/T

=2.09 uci

(c)0,650uci=0.650*3.7*10^4

=24050 bequeral

(d)24050

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