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Radioactivity
Page 4
Questions (539)
Start with a hypothetical sample of 1,024 atoms of a radioactive isotope. Fill out the following table:
# of half lives:0
2 answers
asked by
w
1,125 views
a certain radioactive element has a half life of 31.2 years. in how many years will contamination reach 32% of the original
3 answers
asked by
Deven
661 views
A sample of phosphorus-32 has a half-life of 14.28 days. If 55 g of this radioisotope remain unchanged after approximately 57
3 answers
asked by
hipniblet
983 views
a sample of radioactive iodine (half life=3 days) originally weighed 10 g, but now weighs 0.625 g. How old is the sample?
3 answers
asked by
Valerie
963 views
plz check
Radioactive decay occurs when atoms - lose mass - join with atoms of another element*** - break down to form atoms of
7 answers
asked by
Anonymous
1,444 views
The half-life of rubidium-87 (natural absorbance 27.83%) is 5.1x10^11 years. What mass of rubidium is present if an average
2 answers
asked by
Chemistry
495 views
What is the half-life of polonium-218 if 5.37 minutes are required for the activity of a sample of polonium-218 to fall to 29.5
1 answer
asked by
chan
421 views
what is the time necessary for 99.9%of the atoms of a radioactive compound to be disintegrated? t½=5times.
1 answer
asked by
Anonymous
294 views
A radioisotope P has a half-life of 3 s. At t = 0, a given sample of this isotope contains 8000 atoms. Calculate (i) its decay
3 answers
asked by
gourav
620 views
You have a sample of a certain radioactive substance. After two days, thirty percent of the sample has decayed. What is the
1 answer
asked by
math
459 views
The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463×10^11 years longer. What is the
3 answers
asked anonymously
146 views
A radioactive substance has a half-life of 27 years. Find an expression for the amount of the substance at time t if 20 grams
3 answers
asked by
Jaken
616 views
Sample of 500gms radioactive substance decays according to the function A(t)-500-0.044t where t is the time in years. How much
3 answers
asked by
Deborah
793 views
You have a sample of a certain radioactive substance. After two days, thirty percent of the sample has decayed. What is the
1 answer
asked by
mathhh
468 views
Plutonium-238 is used in bombs and power plants but is dangerously radioactive. It decays very slowly into radioactive
2 answers
asked by
Lizeth Reyes
586 views
If the half life of Ir - 131 is 42 days, how much would be remaining after 168 days?
2 answers
asked by
katie
635 views
Tritium, a radioactive isotope of hydrogen, has a half-life of 12.4 years. Of an initial sample of 69 grams, how much will
2 answers
asked by
Jessica Maths
1,032 views
In addition to uranium, which elements were known to emit radioactive "rays" before M. Curie discovered radium?
1 answer
asked by
Lilly
381 views
How many evaporation's did the curies have to make before they finally isolated radium?
1 answer
asked by
Lilly
353 views
If the half-life of iodine-131 is 8 day, how much would remain undecayed after 8 day if we started with 38 grams?
How much at 16
3 answers
asked by
Dominick
982 views
A radioactive substance decays at a rate of y = ae^-0.1483t, where t in in hours. Find the half-life of the substance.
How do I
2 answers
asked by
Sammantha Avants
713 views
i know that the half life of strontium 90 half-life is 28.8 but how can i explain this???
2 answers
asked by
ColdBreeze23
843 views
.) Iodine 131 is a radioactive waste product generated in nuclear power plants. It has a half life of 8 days. If 16 grams was
1 answer
asked by
BOB
417 views
An isotope has a 12.4 hrs half-life. If it has an activity of 30mCi at noon today, what was its activity at 3 pm yesterday?
2 answers
asked by
VSG
500 views
32% of a particular radioactive substance disappears in 227 years.
Part 1: Find the decay constant. Your answer must be correct
1 answer
asked by
Morgan
453 views
Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new iron sample? Please show
2 answers
asked by
Dani
604 views
Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Please
3 answers
asked by
Dani
596 views
I have tried for days to figure out how to work this problem. Please help show me how to find the answer.
A particular
4 answers
asked by
Tina
668 views
If a 25 mg sample of radioactive material decays to 18.4 mg in 5 years, how long will it take the sample to decay to 20.5 mg?
3 answers
asked by
Brianna
466 views
The half life period of a radioactive element is 27.96 days. Calculate the time taken by a given sample to reduce to 1/8th of
2 answers
asked by
Harsh
840 views
A radioactive isotope has a half life of 8.1 days. If the sample starts with 25 grams, how much will there be after 90 days?
3 answers
asked by
Jennifer
458 views
A lab technician had 58 grams of a radioactive substance. Ten days later, only 52 grams remained. Find the half-life of the
2 answers
asked by
Anonymous
818 views
The decay constant of a radioactive nuclide is 9.5x10^-3 s^-1 . At given instant, the activity of a specimen of the nuclide is
2 answers
asked by
huline3
574 views
How are the terms "activity" and "becquerel" related?
A radioactive isotope source has a mass of 120 g. If the isotope has a half
2 answers
asked by
Anonymous
732 views
Sodium-24, t1/2 = 15.0 hr, can be used to study the sodium balance in animals. If a saline solution containing 25 μg of 24^Na
2 answers
asked by
Kim
492 views
after two hours 1/16th of the radioactive isotope remains undecayed.half life of the isotope is
1 answer
asked by
saritha
475 views
T1/2(Ra-226) = 1602 years
What is the activity of 1 gram of Ra-226? Give the answer in Ci and Bq? What would be this activity
1 answer
asked by
Fatima
419 views
T1/2(Ra-226) = 1602 years
What is the activity of 1 gram of Ra-226? Give the answer in Ci and Bq? What would be this activity
1 answer
asked by
Ali
412 views
Which of the following terms refers to the time it takes for one-half of the radioactive atoms in a sample of a radioactive
7 answers
asked by
Rainshine
1,496 views
If the decay constant for radioactive decay of ^40 K is λ = 5.543*10^(-10) / year, use this equation to calculate ages of the
1 answer
asked by
Maura
737 views
After two hours, 1/16 of the initial amount of a radioactive isotope remains undecayed. What is the half-life of the isotope?
2 answers
asked by
Andrea
1,291 views
The half-life of P-32 is 14 days. How long after a sample is delivered can a laboratory wait to use a sample in an experiment if
6 answers
asked by
K
1,099 views
Hi
Radioactive decay - A radioactive nuclide has a decay constant of - 10^-6 s-1 what is its half life ? I have come up with is
3 answers
asked by
Freddo
506 views
Which aspect must be taken into consideration when creating a model of radioactive decay? (1 point)
There must not be any
3 answers
asked anonymously
68 views
A sample has a activity of 0.0065 Bq per gram of carbon. (a) Find the age of the sample, assuming that the activity per gram of
2 answers
asked by
PLEASE AND THANK YOU
572 views
If a sample contains 70g of Carbon 14 and 70g of Nitrogen 14, how many half lives has it undergone? (show all of your work)
3 answers
asked by
Andy
375 views
cobalt-60 has a half-life of 5.26 years, how much of a 500 gram sample will be left after 21 years
3 answers
asked by
sue moore
893 views
If half of a quantity of radioactive material decays in 10 years, in another 10 years?
1 answer
asked by
AM
464 views
Suppose a laboratory has a 26 g sample of polonium-210. The half-life of polonium-210 is about 138 days.?
1 answer
asked by
sara
693 views
The process of radioactive decay is unpredictable and irreversible. Which option would be an appropriate model of the
3 answers
asked anonymously
50 views
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