The radioactive element​ carbon-14 has a​ half-life of 5750 years. A scientist determined that the bones from a mastodon had lost 80.6​% of their​ carbon-14. How old were the bones at the time they were​ discovered?? The bones were about The bones were about _______year old

Q: Radioactive nuclide, 90Sr, has a half-life of 30 years. What percent of a sample of 90Sr will|…

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Q: Suppose that you start with 3.65 g of a pure radioactive substance and determine 19.6 h later that…

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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 material requires short time to decay completely naturally.Is it true or false?

A: The phenomenon of continuous emission of radiation like alpha, beta, gamma, X-rays, etc. from a…

Q: If a 1.90 cm thick piece of lead can absorb 90.0% of the γ rays from a radioactive source, how many…

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Q: 11.    The half-life of Uranium-237 is 5.83 x 105 seconds. What is the decay constant?

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Q: Manganese-52 has a half-life of 6 days. How many days would a scientist have to wait for the…

A: The radioactivity decay of a sample has a relationship given by:Nt=N0e-λt………(1)where,N0 is the total…

Q: If two grams of a radioactive isotope has a half - life of twenty hours, the half life of one gram…

A: half life of two grams of a radioactive isotope = 20 hours

Q: Mass spectrometric analysis of potassium and argon atoms in a Moon rock sample shows that the ratio…

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Q: An artifact classified as charcoal, found in a site at Epirus, Greece, is found to have a 14C…

A: initial radioactivity(Ro)=0.255 counts per second final radioactivity(R)=4.36 X 10-2 counts per…

Q: Suppose you have a 1 g sample of 226Ra, half-life 1600 years. How long will it be until only 0.1 g…

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Q: For the radioactive isotope strontium-90, k is 2.47 x 10-2 years -1. If the original amount of…

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Q: A sample of radioisotope has a decay constant of 9.976✕10-7 s-1 and prepared with an initial…

A: Given data: The decay constant of a sample of a radioisotope is, The initial activity of a sample…

Q: At present, concentration of  92235U  in naturally occurring uranium deposits is approximately 0.7…

A: Concentration after 1.7 billion year is = 0.13%

Q: How many half lives must pass for the mass of a radioactive sample to decrease to 35% of the…

A: Half life of a radioactive sample is the time required for the sample to reduce to half of its…

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: . The activity of a radioactive sample decreases by 93.75 % in 2.5 years. What is the half-life of…

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Q: The half-life of 60CO is 5.27 years. The activity of an 60 Co sample is 2.60x10° Bq. You may want to…

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Q: What is the half-life of a radioactive isotope if the activity of a sample drops from 6,080 cpm to…

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Q: The half-life of 60?? is 5.27 years. The activity of a 60?? is 3.50 × 109 Bq. What is the mass of…

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Q: The decay rate of an isotope is initially R0 but after one half-life has gone by, the rate is R0/2.…

A: *According to question:-Decay Rate of Isotope initially=Ro& Decay Rate after one-half…

Q: An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 30% more of…

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Q: Determine the age of a certain rock sample: carbon -14 half life = 5730 years. An archeology dig…

A: Given that: t0.5=5730 yrs.A=1 CpmA0=16 Cpmλ=?t=?

Q: If a 1.50-cm-thick piece of lead can absorb 90.0% of the γ rays from a radioactive source, how many…

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Q: Radium-226, the first radioactive isotope used for its radioactive properties, has a half life of…

A: Radium-226 has a half-life, T12=23.0 centuries. The value of the rate constant is given by: λ=ln2T12…

Q: The half-life of a radioactive isotope is 140 d. How many days would it take for the decay rate of a…

A: Given:  Half life of the isotope, T = 140 days

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: Given that radioactive cobalt-60 has a radioactive constant equal to 3.8 x 10° s determine its…

A: Given information: Here, λ is the radioactive constant or decay constant.

Q: The half-life of 23U is 4.5 x 10° yr. A sample of rock of mass 1.6 g produces 29 dis/s. Assuming all…

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Q: How many radioactive nuclides are in a sample with a radioactivity of 3.1 kCi? The half-life of the…

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Q: The half-life of a radioactive nuclide is 20 years. If a sample of this nuclide has an activity of…

A: Formula of radioactivity is as follows: I=I0e-λt…

Q: If a 1.50-cm-thick piece of lead can absorb 90.0% of the γ rays from a radioactive source, how many…

A: Given data The thickness of the lead piece is x = 1.50 cm. Lead can absorb 90% of the γ rays.…

Q: Technetium-99m is a radioactive isotope with a half-life of 6 hours. If a sample of was originally…

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Q: Carbon-14, with a half-life of 5730 years, has a decay constant of λ = 1.21 × 10-4 yr-1. A piece of…

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Q: State the law of radioactive decay. Plot a graph showing the number (N) of undecayed nuclei as a…

A: The law of radioactive decay: "The number of nuclei undergoing radioactive disintegration per unit…

Q: The half life of radium is 1.62x10^3years. What fraction of radium would remain after 1.0x10^3years?…

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Q: A radioactive sample was measured 9.1 years ago. It had an activity of 9783.8 Bq. Today, its…

A: Given: The intial activity of the sample is 9783.8 Bq. The final activity of the sample is 21 Bq.…

Q: What is the half-life of Ra-226?

A: The time in which the activity of the radioactive substance becomes half is called half life.

Q: The activity of a particular radioactive nuclide falls from 1 × 1011 Bq to 2 × 1010 Bq in 10 hours.…

A: Given, The activity of a particular radioactive nuclide falls from 1 × 1011 Bq to 2 × 1010 Bq in 10…

Q: A radioactive isotope has decayed to the point that 1/32 of the original content is left. How many…

A: Given data: The ratio of remaining content to original content  = 1/32 Required: Number of…

Q: which radioactive decay mode does no result in a different nuclide?

A: Majorly there are 3 types of nuclear decays: Alpha decay: In this decay an alpha particle which has…

Q: Radioactive nuclide, 9ºSr, has a half-life of 30 years. What percent of a sample of 9ºSr will remain…

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Q: The half-life, which is unique to any given isotope, is defined as:

A: We know  half life :-The time taken for half of the original population of radioactive atoms to…

Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.