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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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The half life of Oxygen-15 is 2 minutes. What fraction of a sample of Oxygen-15 will remain after 5 half lives?
Therefore halve lifes after 2 mins100% =50% =12.5%= 6.25%= 3.125%Therefore;3.125/100 = 0.31250.3215 = 1/32
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The half-life of the radioisotope carbon-14 is 5730 years. How much C-14 will be left after 3 half-lives, if the initial amount is 100.0 g?
Solution: We find the part remaining after 3 half-lives: (1/2)3 = 0.125 We find how much is left: 100.0 g x 0.125 = 12.5 g remain Answer: 12.5 g C-14...
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A balloon filled with helium has a volume of 37.1 L 37.1 L at 285 K. 285 K. What volume will the balloon occupy at 253 K? 253 K?
Volume =32.93L
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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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How much 2.0 % salt solution can be made to fill the bags of a hospital if 16.7 of salt are available ?
A. 835 solution
B. 334 solution
C. 0.334 solution
D. 835000 g solution
16.7 g of salt are available16.7 * 100 / 2 = 835 g - solution massAnswer A
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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;
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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?
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
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After 300 days have elapse 53% of a radioisotope sample decayed. What is the half-life of the radioisotope?
For half life, 50% should have decayed so we use proportions to find how many days 50% of the isotope had decayed.53% is equivalent to 300days. We find 50%(50÷53)×300=283days
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