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the half-life of Sr-90 is 29 years. what fraction if the atoms in a sample Sr-90...
Sr-90 has a half-life of 29.1 years. How long will it take for the activity of a Sr-90 sample to decay from 5.3 times 10^3 dpm (disintegrations per minute) to 3 times 10^2 dpm? The half-life of a radioisotope is 3 d. What percent remains after 1 week?
The Strontium-90 isotope has a half-life of 28.1 years. Supposed we used a .10 Curie sample of Sr-90. That is, we used enough Sr-90 to have an activity of .10 Ci (1 Ci=3.7x1010 disintegrations/second) Calculate the activity of this sample when used by students 281 years from now.
What fraction of a sample of 6832Ge, whose half-life is about 9 months, will remain after 2.1 yr ?
If carbon-14 has a decay half-life of 5730 years, what fraction of the original carbon-14 would you expect to remain intact in a 3000 year old parchment scroll, and why?
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
If the half-life, 11/2, of 90 Sr is 9.09 x 108s, it would take 3.64 x 10's of time to transpire in order for 90 Sr to drop to 16th of its original amount. True False
If C14 has a half-life of 4,000 years, what fraction will be remaining after 36,000 years? IfI 131 has a half-life of 8 days, what fraction will be left after a year?
A sample of 9.0×109 atoms that decay by alpha emission has a half-life of 90 min. How many alpha particles are emitted between t=50min and t=200min? Express your answer using two significant figures.
Create a chart to work this problem. Sr-90 has a half-life of 29.1 yr. How many yrs. from now will the first half-life be completed? the second half-life? the third half life?
Strontium-90 has a half-life of 28.1 years. Starting with 3.2 mg of this isotope, how much would remain after 112.4 years?