A radioactive sample of an isotope with a half-life of 24 hours has an activity of 3×10^5 Bq when delivered to a physics lab. What is the activity of this isotope exactly 14 hours later when it is to be used in an experiment?

Q: Cesium-137 is radioactive and has a half life of 30. years. Calculate the activity of a 1.4 mg…

A: Given value--- half life time = 30 year . mass = 1.4 mg. We have to find---  Calculate the…

Q: A 44.5 g sample of carbon has an activity of 8.55 decays per second. How old is it? Please give your…

A: Given data The mass of the sample of carbon is given as m = 44.5 kg.  The number of decays is given…

Q: A radioactive isotope has a half-life of 72.0 min . A sample is prepared that has an initial…

A: (a) Initial radioactive nuclei

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: Your company develops radioactive isotopes for medical applications. In your work there, you measure…

A: We know,  the activity equation is given by A=A0e-λt From the table it is seen that A0=20,000 At…

Q: Strontium is chemically similar to calcium and can replace calcium in bones. The radiation from ⁹⁰Sr…

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Q: A sample of a radioactive isotope with a decay constant of λ = 4.27 × 10-3 s-1. A sample of the…

A: we know activity R =λN where λ = decay constant  N = number of particle given  N = 2.68 × 1015…

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: A certain isotope has a half-life of 6.4 h and an atomic mass of 87.29 u. What will the activity in…

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Q: Gamma rays may be used to kill pathogens in ground beef. One irradiation facility uses a 60Co source…

A: The total amount of energy of gamma rays per beta decay of 60Co can be given as, Here, ε represents…

Q: 3. A sample of a radioactive isotope is found to have an activity of 115.0 Bq immediately after it…

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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: To destroys cancerous tumor , a dose of gamma radiation totaling an energy of 2.12J is to be…

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Q: A tree falls in a forest. How many years must pass before the C activity in 1.00 g of the tree's…

A: mass = 1 g number of atoms = number of moles * avogadro number  = (1/14)(6.022 * 1023) = 4.3 * 1022…

Q: To cure thyroid cancer, a child is injected with the radioisotope Iodine-125, which emits x-ray…

A: Given, To cure thyroid cancer, a child is injected with the radioisotope Iodine-125, which emits…

Q: A piece of radium has an activity of 92 mCi. (a) What is the mass of the radium?

A: Given: The activity of the radium is 92 mCi. The molecular mass of the radium is 226.

Q: Radioactive iodine isotope I of half-life 8.0 days is used for the treatment of hyroid gland cancer.…

A: activity = rate of disintegration             = λ(dN/dt)

Q: A radioactive sample with a half-life of 5.3 weeks has 1.04e+15 nuclides present in the initial…

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Q: A 200.0 - mCi sample of a radioactive isotope is purchased by a medical supply house. If the sample…

A: The time taken for the activity reduced to 20.0 mCi.

Q: Gamma rays may be used to kill pathogens in ground beef. One irradiation facility uses a 60Co source…

A: We know that 1Ci=3.7×1010decay/sec The given activity is =1.0×106Ci. Then the activity on decay/sec…

Q: A certain isotope has a half-life of 5.9 h and an atomic mass of 95.98 u. What will the activity in…

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Q: In many cases, prostate cancer is treated by implanting 60 to 100 small seeds of radioactive…

A: Given data: The half-life of palladium is t1/2=17 days. The mass contained by the grain is m=0.27…

Q: Barium-133 is a radioactive element used in certain medical procedures.  A sample of pure Barium133…

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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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