After 85 years, 80 % of a radioactive material decays. What is the half-life?
Q: A radioactive material produces 3.522E+3 decays per minute at one time, and 5.47 h later produces…
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Q: A particular radioactive material was weighed exactly 1 year ago, showing a mass of 200 g. If the…
A: Given: Mo=200 gM=23.0 gt=1 year = 365 days
Q: The half-life of a particular element is 330 days. What is its decay constant?
A: The relationship between Half life t1/2 and decay constant λ is t1/2=ln2λ=0.693λ where ln2 is…
Q: Plutonium-239 has a half life of 24100 yr. Starting with a sample of pure 239 Pu, how long would it…
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Q: A 30 g radioactive isotope has a half-life of 6 years. How much of the isotope will be left after 12…
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Q: If a material has a half life of 92.5 days, how long will it take for 75% of the material to decay?…
A: Half life of the material=92.5days 75% of the material decay
Q: A radioactive sample has a mass of 185 grams. How much remains after 2 half lives?
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Q: A sample of radioactive material contains 1x 1014 atoms and has an activity of 6.3 x 1011 Bq. What…
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Q: Radon gas has a half-life of 3.83 days. If 2.86 g of radon gas is present at time t = 0, what mass…
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Q: it has taken 30 days for a particular nuclide to decay to 25% of its original activity. what is the…
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Q: archaeologist sometime in the future analyzes the iron used in an old building. The iron contains…
A: half life of Ni -63 t/2 = 92 years LET x half life passed (N0 /2)X =( N0 / 128 ) = (N0 /2)7 X = 7…
Q: sample of radioactive material starts with 0 grams. After 3 half lives have passed, how much…
A: Half-life is the amount of time it takes for one half of a sample of a radioactive isotope to decay.…
Q: The radioactive isotope 209 Po has a half-life of 103 years. How long would it take 84 for only 4.00…
A: Given: The half-life time is 103 years. The remaining sample is 4 g. The total amount of the sample…
Q: The decay constant of a radioactive source is 752 per year. Then its half- life equals: *
A: Step:1 The Time taken for a radioactive atom to disintegrate to half of its original…
Q: unknown radioactive element decays into non-radioactive substances. In 480 days the radioactivity of…
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Q: The half-life of a particular element is 330 days. What is its decay constant?
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Q: 75% of a quantity of U-232 remains after 30 years. What is the half-life?
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Q: A radioactive sample contains 2048 nuclie. How many of its nuclei decay after two half lives?
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Q: A radioactive sample studied in a lab is found to have a half-life of 48 hours. If the initial…
A: Radioactive decay is the process by which an unstable nucleus becomes stable. The half-life for a…
Q: Carbon is one of the fundamental elements in everything that's alive on Earth. The three naturally…
A: Carbon has generally three isotopes found in nature. Isotopes are those which have the same proton…
Q: The half-life of a radioactive isotope is known to be exactly 1 h. a) What fraction of a sample…
A: Given in question - Half-life (T) = 1 hour Solution: Step1 - Here we will understand the concept…
Q: A nuclide whose "generic" symbol is 6430X would have protons and neutrons.
A: The generic symbol of a nuclide is given as X3064.
Q: A particular radioactive material was weighed exactly 1 year ago, showing a mass of 200 g. If the…
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Q: What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?
A: Time=7 half life
Q: What fraction of radioactive nucleus sample survive after two half-lives?
A: Half-life is the time taken by the radioactive element to become the half of the original amount as…
Q: A radioactive material produces 4.386E+3 decays per minute at one time, and 7.57 h later produces…
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Q: Supposed that a radioactive substance has decayed until only of 1/8 of it remains. How many…
A: let initial number of Nucleons= N0 remaining number of Nucleons= N =N08
Q: 64 g of a radioactive substance is prepared. 105 hours later, only 16 g remains. To the nearest…
A: To the nearest hour, the radioactive half-life of the substance is 52.5hours
Q: Tritium (half-life = 12.3 yr) is used to verify the age of expensive brandies. If an old brandy…
A: The amount remaining is equal to the original amount times 1/2 raised to the of half-lives that have…
Q: radioactive substance has a half life of 2120 years. A) Determine the rate constant for the decay…
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Q: A radioactive sample has a decay constant of 0.219 3/minute. (a) What is its half-life? (b) If at…
A: The relation between the half life and the decay constant is T = 0.693λ The equation of…
Q: A radioactive sample has a half-life of 28 mins. If the initial amount of sample was 2 g, estimate…
A: Radioactive decay takes place when an atomic nucleus becomes unstable. The rate of decay is known as…
Q: The half-life of radon-222 is 2.8 days. How many days would it take for the activity due to radon in…
A: Given that:- Half life of radon-222=2.8 days
Q: Xe-124 an isotope of xenon has the highest half-life of 1.8 × 1022 yrs. Estimate the time it would…
A: When a nucleus becomes unstable it will undergo radioactive decay to attain a stable configuration.…
Q: A pure sample of a newly discovered radioactive isotope is discovered. It has a half-life of 78 y.…
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Q: The half-life of uranium–238 is 4.5 billion years. What is the decay constant for uranium–238?
A: Calculation: The half life time of the uranium238 is 4.5 billion years.
Q: A radioactive isotope has a half-life of 4 days. How much of the isotope is left in a 20-mg sample…
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Q: How much mass of a decaying 1kg sample with a half-life of 3hours will be left after 1 day has…
A: Given - Initial mass of the sample Mo= 1 kg Half life of the sample T1/2 =3 hours Time period for…
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