The half-life for the a decay of uranium 2U is 4.47 x 10° yr. Determine the age (in years) of a rock specimen that contains 48.6% of its original number of atoms. t-Number Units

Q: When we talk about radioactive decay, we often talk about a half-life, i.e. the amount of time it…

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Q: a- The half-life of the radioactive nucleus Ra is about 1.6 x10 yr and the initial activity is…

A: Given t0.5 = 1.6 ×103 yr           No=11.3uCi  and we need to find difference in decay rate and…

Q: A radioactive sample has a decay constant of 55.0 x 10-¹2 s¹. Estimate its half-life.

A: Radioactive decay is the process by which unstable nuclei spontaneously lose energy to become…

Q: A sample of radioactive material is obtained from a very old rock. The activity of the rock over a…

A: Given that: The equation of the activity of a radioactivity substance is A=A0e-λt The slope of the…

Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…

A: Number of Thorium nuclei in 390mg of thorium is N  = 60.2*1023/mol/232g/mol *(390*10-3g)     =…

Q: Atts, you have a pure sample of an unknown substance. At t= 293 s, 36.8% of the substance remains.…

A: Radioactive substance remaining at t=293s, N=36.8100×N0=0.368N0

Q: The graph below shows the decay of a sample of 14C that initially contained No atoms. Decay Plot No…

A: Half-life is the time taken to disintegrate half of the initial concentration.

Q: A radioactive sample with a half life of 4.8 weeks has 3.05e+15 nuclides present in the initial…

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Q: The isotopes of U8 and U5 occur in nature in the ratio 140 : 1. Assuming that at the time of earth's…

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Q: By READING the R vs t graph shown below, determine R, & the half-life. R (x10¹2 decays/h) 80 60. Ro…

A: Given From the given graph of Decay rate vs time  R0 is the rate of decay at t =0 Therefore ,   R 0…

Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…

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Q: A new element, Philosophium, was discovered. It has a decay constant of 2.90 x 10-3 s¹ and is a…

A: The formula for alpha decay is: N(t)=N0e-λt .......................... (1) where N(t) is the amount…

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

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Q: A radioactive sample has an activity of 250 Bq and contains 6.52×10¹³ radioactive nuclides. Estimate…

A: The rate at which this decay takes place in a given sample of radioactive material is called its…

Q: You have an istope with a decay constant of 2.48x10-³s-¹. What is the half life of isotope?

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Q: A radioactive sample has a decay constant of 2.97 x 10 s¹¹. Estimate the half-life.

A: Unstable nuclei decay into a stable state. This process is called radioactivity. The rate at which…

Q: element

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Q: A particular radioactive sample undergoes 2.50××10^6 decays/s. a) What is the activity of the…

A: In the given question , We have to determine  the values of given parts.

Q: 1. The decay of radioactive substance is given by -t T N = Nᵒe (1), where N is the number of atoms…

A: You are using incorrect symbol for Tau (decay constant).

Q: a sample containing l-131 has an activity of 6.4x10^8 Bq.h how many days later will the sample have…

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Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…

A: Hlf-life time of radioactive element is Mass of element is Note:Molar mass of  is Avogadro's number…

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: Based on data acquired during a radioactive decay lab using an unusual assortment of geometrically…

A: The trendline equation for radioactive decay can be expressed as: N(t)=No×e(-λt) where: N(t) = the…

Q: Example 6: A test tube of an isotope having a decay constant of 0.765 × 10-6 s-1 contains 3.0 x 1017…

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Q: Marie and Pierre Curie managed to extract 1 mg of radium from ten tonnes of uranium ore in 1898. The…

A: The decay constant for radium-226 can be calculated using the following formula: λ = ln(2)/ t½ Where…

Q: on gas has a half-life of 3.83 days. If 2.92 g of radon gas is present at time t = 0, what mass of…

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Q: Problem 8:  In a living organism, a fixed fraction 1.30 × 10-12 of 12C is the radioactive isotope…

A: Given data: fixed fraction =1.30 × 10-12 of 12C Need to determine the numeric value is expected.

Q: How many half-lives must elapse until (a) 77% and (b) 99 % of a radioactive sample of atoms has…

A: Solution in answer, feel free to ask for clarifications if needed.

Q: The number of radioactive nuclei present at the start of an experiment is 5.38 x 1015. The number…

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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: A 10 g sample of a radioactive element takes 16.21 mins to reduce into 6 g. Calculate the half-life…

A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…

Q: unlabeled container of radioactive material has an activity of 78 decays/min. Four days later the…

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Q: After 85 years, 80 % of a radioactive material decays. What is the half-life?

A: Given, Time,t=85yrs=85×3.154×107sPercentage of the material decay= 80% We have the expression for…

Q: gram of caesuim (55 Cs) decays by B-emission with a half life of 30 years. (a) Name the resulting…

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Q: a) What is the decay constant of fluorine-17 if its half-life is known to be 66.0 s? λ = b) How…

A: Given value--- Half life time of F -17 (t 1/2) = 66 sec. We have to find--- What is the decay…

Q: If it is known that 87% of an initial radioactive sample remains after 3 days, what is the decay…

A: Given: The amount of radioactive decay is 87% of the initial amount. The time is 3 days.