An unknown radioactive element decays into non-radioactive substances, In 910 days the radioactivity of a sample decreases by 45 percent. (a) What is the half-tite of the element? (days) (b) How long will it take for a sample of 100 mg to decay to 87 mg? time needed

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Q: (b) 1°BE (c) Al (d) 2°N

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Q: The half-life of 143TC, a ߯ emitter, is 15.8 s. (a) How many atoms of 43TC are present in a sample…

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Q: 7. If we start with 1.000 g of strontium-90, 0.953 g will remain after 2 years. (a) What is the…

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A: Given the half-life of I-131, t1/2 = 8.0 days Initial activity, Ao = 9.9 mCi

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

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Q: Zr 32. After 195 days, a 10.0 g sample of pure has decayed to the extent that only 1.25 g of the…

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Q: The steps below show three of the steps in the radioactivedecay chain for 23290Th. The half-life of…

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Q: 1a) How long will it take for 30 g of 222Rn to decay to 7.5 g? 1b) How many grams of 1°N will be…

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Q: How many half-lives have passed in each of the following situations? (a) Initially the sample is…

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Q: As mentioned in the previous Practice Exercise 1, cesium-137, a component of radioactive waste, has…

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Q: a substance with a half-life of 23.1049 seconds. you start with 12 mg of the substance (a) write the…

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Q: Radium-221 has a half of 30 sec. How long will it take for 82% of a sample to decay?(Round your…

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Q: The half-life of 1311 is 8.04 days. (a) Convert the half-life to seconds. (b) Calculate the decay…

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Q: 4.605 The time for 99% of a sample of a radioisotope to decay is given by the equation to.99 = k…

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Q: What is the half-life of iron-55 if 5.93 years are required for the activity of a sample of iron-55…

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Q: 8. Strontium-90 has a half-life of 28 days. ovn brs (a) A sample has a mass of 50 mg initially. Find…

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Q: Chlorine-38, which undergoes beta-negative decay, has a half-life of 37.24 min. K/U T/I C (a)…

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Q: The nuclide ⁹5Nb decays by beta emission with a half-life of 35.0 days. The mass of a ⁹5Nb atom is…

A: Half life of N95b , t1/2=35.0 days

Q: If we start with 1.000 g of strontium-90, 0.953 g will remain after 2 years. (a) What is the…

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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.