sample of radioactive material starts with 0 grams. After 3 half lives have passed, how much radioactive sample remains?

Q: Different nuclides of the same element have the same number of protons and the same number of…

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Q: How does the mass number of an element change when it undergoes alpha decay? decrease by 2 decrease…

A: In Alpha decay of an radioactive nucleus , the mass and charge of the daughter nucleus decreases by…

Q: One hundred kilograms of a certain radioactive substance decay to 40 kg after 10 years. How much…

A: Given data The initial mass of the radioactive substance is: Xo = 100 kg The mass of the radioactive…

Q: After how many half-lives will (a) 10.0%, (b) 5.00%, and (c) 1.00% of a radioactive sample remain?

A: Formula to calculate the number of half-lives is,

Q: Krypton-81m (81mKr) is a radioactive isotope with a half-life of 13.1 s that is often used in…

A: The correct option is (e) 50.26 s

Q: A radioactive sample has a mass of 185 grams. How much remains after 2 half lives?

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Q: If 100 grams of a radioactive substance is left to decay, how much would be left after 5 half-lives?…

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Q: The radioactive isotope (95 Nb) has a half-life of 35 days. A sample containing this isotope has an…

A: Let the half -life of the isotope be denoted as t1/2 .The expression for the decay constant λ in…

Q: The radioactive isotope (95Nb) has a half-life of 35 days. A sample containing this isotope has an…

A: Half life , T12 = 35 days =35 x 24 = 840 hours  Initial Activity , A0 = 4.5 x 108 Bq T1 = 36 hours…

Q: The radioactive isotope 234pa has a half-life of 6.70 h. A sample containing this isotope has an…

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Q: The half-life of a radioactive isotope is the amount of time it takes for a quantity of radioactive…

A: The amount of radioactive material left after decay for some time is given by A = Aoe-λt, where A =…

Q: There was initially 100mg of radioactive material. After 6 hours, its mass decreased by 3%. If at…

A: 100 mg of radioactive material is given. After 6 hours, mass decreases by 3%. It is asked how much…

Q: The radioactive isotope (183-Ta) has a half life of 5.11 days. A sample containing the isotope as an…

A: Given data: Half-life t12=5.11 days Initial activity R0=4.5×108Bq

Q: When an unstable nucleus decays by emitting an alpha particle, the atomic mass number of the nucleus…

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Q: A significant fraction of the radiation dose you will receive during your life comes from…

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Q: The radioactive isotope 31Si has a half-life of 2.62 h. A sample containing this isotope has an…

A: decay constant (d) = 0.693/half life d = 0.693/2.62 hr -1 d = 0.2645 hr-1 d = 0.00007347328 sec-1…

Q: The half-life of a radioactive isotope is the amount of time it takes for a quantity of radioactive…

A: Ans (a) in this question half life of c-14 is given as 5230 years so    Thalf=5230y and we know the…

Q: A radioactive nucleus has half-life T1/2. A sample containing these nuclei has initial activity R0…

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Q: 9: In which type of decay does a neutron turn into a proton like the one shown below?   A: alpha…

A: Beta decay is occur in the necleus where number of proton and neutrons are very high. The proton…

Q: 18. 2. The half-life of a radioactive sample is 30 minutes. If the sample originally contains 4x10°…

A: The half-life of a radioactive isotope is the amount of time it takes for one-half of the…

Q: A radioactive sample contains 9.5 x 1017 atoms of a nuclide that decays at a rate of 5.4 x 1013…

A: Radioactivity is the process of decay of heavy nuclei due to an unstable nuclei or due to a…

Q: A radioactive sample contains 5.50g of pure N(7, 13), which has a half-life of 10 min. Calculate the…

A: We need to calculate activity after 2 hours and whether this isotope is useful for dating for 10…

Q: _was the first to calculate how much more energy an atom release in radioactive decay that it does…

A: F. Soddy was the scientist

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: In a radioactive substance at t = 0, the number of atom is 8 x 104 . its half-life period is 3 yr.…

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Q: The radioactive isotope (Nb) has a half-life of 35 days. A sample containing this isotope has an…

A: Write the expression for the decay constant.

Q: In radio-pharmacy Alpha, Beta-plus, Beta-minus and Gamma decay are all different forms of…

A: Solution Beta-minus decay.  In Beta minus decay neutron is converted into proton and electron with…

Q: If 10% of a radioactive material decays in 5 days, then the amount of the original material left…

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Q: At 6:00 AM a hospital uses its cyclotron to make 1 milligram of the isotope fluorine-18 for use as a…

A: The initial value of isotope fluorine -18  is N0 = 1 mg. The half-life of F-18 is 1.8 hr. F-18 left…

Q: In the gamma decay of a nucleus   A) the mass number of the nucleus changes whereas its atomic…

A: When some unstable atomic nuclei dissipate excess energy by a spontaneous electromagnetic process,…

Q: What is the half-life of an isotope that decays to 6.25% of its original activity in 24.2 h?…

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Q: The activity of a radioactive sample decreases from 135 kBq to 15 kBq in 22.1 s. Calculate the…

A: Given  Initial activity A0=135kBq Final activity A=15kBq time t=22.1 s

Q: freshly prepared sample of a certain radioactive isotope has an activity of 3.7 × 1011 decays/s.…

A: Given data R0=3.7×1011 decays/sR=2.96×1011 decays/st=4 h=4×3600 s

Q: In 4 years, 3/4 of nuclei of a given radioactive substance is decayed. What is the half- life of the…

A: Definition of  Half life:- Half life of a radioactive sample is defined as the time elapsed before…

Q: The curve to the right shows the radioactive decay of a particular sample of a nucleus called…

A: From the graph, we can notice that No = 400 N = 100 after 10 hrs

Q: Consider a radioactive sample. Determine the ratio of the number of nuclei decaying during the first…

A: Radioactive decay:

Q: Radioactive isotopes often occur together in mixtures. Suppose a 100 g sample contains 131Ba, with a…

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Q: A radioactive sample has an activity R. For each of the following changes, indicate whether the…

A: At time t, number of radioactive nuclei = Nt

Q: In radio-pharmacy Alpha, Beta-plus, Beta-minus and Gamma decay are all different forms of…

A:

Q: What fraction f1 of a radioactive sample will be left after 6 half‑lives?   What fraction f2 of a…

A: To determine: 1) fraction f1 of a radioactive sample will be left after 6 half‑lives 2) fraction f2…

Q: he half-life of the radioactive nucleus 88 Ra 226 is 1.6 × 10 3 yr. If a sample initially contains…

A: