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131-Iodine has a half life of 8.1 days. How much of a 1800 gram sample remains after 20 days?
325.0787381N(t)= N(o)(1/2)^t/t1/2Where N(t) = Remaining massN(o) =Original massT =TimeT1/2 = Half lifeN(t) = 1800(1/2)^20/8.1= 1800(0.5)^20/8.1=325.0787381 grams
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How many half-life cycles does it take for a sample of radioactive isotope to reach 12.5% of its original mass?
If we start with 100% of a sample , we can keep dividing this number by 2 until we reach 12.5% to find out how many half lives passed.Remember, when the sample...
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Suppose you have an element with a Radioactivity of 175 Rad. What will be the resulting Radioactivity if it undergoes its a)1st half-life? b)2nd half-life? and c)5th half-life? with solution
a) 87.5 Radb) 43.75 Radc) 5.46 Rad
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Vial contains radioactive iodine-131 with an activity level of 2.0 mCi. Thyroid test requires 3.0 mCi. How many mL needed to prepare solution?
You would need 1.5 ml to get atotal of 3 mCi I131 Stock solution contains 2.0 mCi/ml * X ml = 3.0 mCi X= 3.0/2.0 X= 1.5 ml
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A radioactive sample with a half-life of 3hrs contains 25-mCi radioactivity. The radioactivity of the sample after 9 days days would be?
9 × 24 = 216hours3hr =25mCi216= ?= 216× 25/3= 1800mCi
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Fermium-253 has a half life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half lives. How much time will elapse for this sample to be considered gone?
Therequired time is 0.334*10 = 3.34 seconds.
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The half-life of iodine-131 is approximately 8 days. How much of an original 272g sample would be left after 32 days?
17g
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Suppose you have an element with a Radioactivity of 175 Rad. What will be the resulting
Radioactivity if it undergoes its a)1 st half-life? b)2 nd half-life? and c)5 th half-life?
The radioactivity changes according to this equasion: A=A0/2n; A0 - initial radioactivity;A - radioactivity after it undergoes n half-life decaya) A=175/2=87.5 Rad;b)A=175/22=175/4=43.75 Rad;c)A=175/25=175/32=5.47 Rad;
1 Answers 1 views
Suppose you have an element with a Radioactivity of 175 Rad. What will be the resulting
Radioactivity if it undergoes its a)1st half-life? b)2nd half-life? and c)5th half-life?
a) 87.5 Radb) 43.75 Radc) 5.46 Rad
1 Answers 1 views
Suppose you have an element with a Radioactivity of 175 Rad. What will be the resulting Radioactivity if it undergoes its a)1st half-life? b)2nd half-life? and c)5th half-life?
a) 87.5 Radb) 43.75 Radc) 5.46 Rad
1 Answers 1 views