How long does it take for 87.5% of each isotope to decay? Kr-91 Kr-89 min Kr-79 h Kr-81 yr

Q: Isotopes X goes through a BETA decay and becomes isotape Y. isotape Y goes through an ALPHA decay…

A: The different types of radioactive decay are as follows; α-decay               ⇒             XZA  →…

Q: How much time in years (assume a 365 day year for each year) would it take for a 1.805 g sample of…

A:

Q: Co-60 is used extensively in radiotherapy as a source of y-rays. Its half life is 5.27years. a) How…

A: half life = 5.27 years

Q: The half-life of strontium-90 is 28 years. H

A: Given t1/2 of a reaction is 28 years  decay constant  (λ) λ = 0.693t1/2     = 0.69328 y     =…

Q: Barium-142 is an beta emitter with a half-life of 11.0 min. If we start with 2.500 g of 142Ba, what…

A: The number of half-lives (n) can be calculated as

Q: How many days will it take for a radioactive isotope with a half-life t1/2 = 134 days to decay to…

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Q: A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life?

A: Given is the radioactive isotope.We know any radioactive decay follows first order  reaction…

Q: 8. How long does it take for 65.0% of each isotope to decay? Half-Life 27 s 11.5 min 14.8 h 2.1 X…

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Q: If the half-life of a radioactive element is 30.0 years, how long will it take to decay to the point…

A: For the first order reaction we have the formula as : k*t = ln(A/At) Where A is the initial…

Q: How many half lives will it take for 50 g of "Tc to decay to 6.25 g?

A: Half-life period was discovered by ernest Rutherford in 1907. Rutherford applied the principle of a…

Q: A sample of 11C has a half-life of 20.4 minutes. What is the Decay Constant of this sample? If the…

A: (1) For radioactive decay: Decay constant : λ=0.693t12=0.69320.4 minute-1 = 0.034 minute-1    (2)…

Q: After 119 days have elapsed, 1/12 of a radioisotope sample remains undecayed. What is the half-life…

A: Amount of radioisotopes remaining = 112 of the initial amount Number of days taken for the decay =…

Q: It takes 32 days for 512 grams sample of element X to decay to final amount of 4grams. What is the…

A: We are asked to calculate the half-life of element X.

Q: the half life of iodine-131 is 8 days, after how many days will a sample of it decay to 70% of its…

A: As we know,  Radioactive decay follows 1st order kinetics.Integrated rate law equation for 1st order…

Q: Iodine-131 has a half-life of 8 days. What fraction of the original sample would remain at the end…

A: Half life is the period at which concentration of reactant reduces half of its original value.

Q: A rock contains 0.232 g of Pb-206 to every 1.00 g of U-238. Determine the age of this rock assuming…

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Q: What is the particle emitted when plutonium-244 decays into americium-244?

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Q: 10 half lives

A: 1/1024 fraction of original radioactive material remains after 10 half lives.

Q: How long will it take for a 40.0-gram sample of Iodine-131 to decay to 1/16th of its original mass?…

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Q: Phosphorus-32 has a half-life of 14.0 days. Starting with 6.00 gg of 32P32P, how many grams will…

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Q: Americium-241 is a radioactive isotope that is used in smoke detectors. It has a half-life of 432.2…

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Q: The half-life of 87Sr is 2.80 h. Calculate how much time it would take for an isolated quantity of…

A: Time required to decay for a radioactive molecule,t = 2.303Klogaa-x Where a is the initial amount…

Q: Radium-221 has a half life of 30 seconds. How long will it take for 82% of a sample to decay?

A: Half life =30 seconds Decay percentage = 80%

Q: An unknown radioactive element decays into non-radioactive substances.  In 660 days the…

A: Rate constant (k)= 2.303/t log 100/49 So k = (2.303/660) ×0.3098 =0.0011 days ^-1

Q: The half-life of 51Cr is 2.78×101 day. Calculate how much time it would take for an isolated…

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Q: How long does it take a 11.1 : 108 Bq sample of gold- 198 to decay so that only 1.39 : 108 Bq…

A: Given: Initial amount, A0=11.1 : 108 Bq After the time 't', the amount, A= At=1.39 : 108 Bq

Q: The half life of 52Fe is 8.28 hours. Suppose we measure the activity of a sample containing 52Fe and…

A: Calculation of disintegration constant (λ):T1/2 of 52Fe is = 8.28 hours.

Q: Based on Plutonium's half-life, why is it so hard to dispose of?

A: According to research,  Plutonium has two isotopes, Pu-239 and Pu-241.  Here, Plutonium-239 has a…

Q: The radioactive nuclide 235 U decays with at1/2 of 703.8 million years. Calculations reveal that…

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Q: Radium 223 decays with a 1/2 life of 11.4 days. How one will it take for 0.240 mol sample of radium…

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Q: If the half-life of iodine-131 is 8.10 days, how long will it take a 50.00 g sample to decay to 6.25…

A: Given - Half life of iodine -131 =8.1 0 days  Initial weight of sample= 50.00 gram  Final weight of…

Q: Radioactive isotopes can be used to calculate the age of materials because their decay rates are A…

A:

Q: The​ half-life of​ silicon-32 is 710 years. If 20 grams is present​ now, how much will be present…

A: Radioactive decay is always a first order reaction. The rate equation for the radioactive decay is :…

Q: How much time in hours would it take for a 1.330 g sample of 233Pa to decay to a mass of 0.8628 g if…

A: Given, Half life = 5.1473 x 106 s Initial Mass of sample = 1.330 g  Time = ?

Q: A radioactive isotope has a half life of 60.2 minutes.How long will it take for radiation from a 325…

A: The radioactive decay of an isotope follows a first-order reaction, The integrated rate law for a…

Q: If one-trillionth of the atoms of a radioactive isotope disin-tegrate each day, what is the decay…

A: One trillionth of radioactive isotope decay takes place in a day. I trillion = 1.0 x 1012  The…

Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.