A sample of 134La(T/2 = 6.5 min) has an activity of 4 curies. What was its activity one hour ago?
Q: What is the activity of a 20 ng sample of 92Kr, which has a half-life of 1.84 s?
A: In 92gm of 92Kr, will contain 6.02×1023 atoms of 92Kr.
Q: A sample has a ¹4C activity of 0.0052 Bq per gram of carbon. (a) Find the age of the sample,…
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Q: A drug prepared for a patient is tagged with 4399Tc, which has a half-life of 6.05 h. The dose…
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Q: Calculate the activity of a pure 9.5-μgμg sample of 32 over 15P (T1/2=1.23×106s).
A: Mass of sample (m) = 9.5 ×10-6 grams Molecular mass of P-32 = 32 grams Half life (T1/2) = 1.23×106…
Q: P5 A reindeer owner finds a 5-year-old reindeer roast in his freezer. When the steak was placed in…
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Q: The charred bones of a sloth in a cave in Chile represent the earliest evidence of human presence at…
A: Given, Specific activity of bone (N)=5.22 disintegrations per minute per gram of carbon (d/min.g).…
Q: A radioactive sample with a half-life of 3.1 s initially has 10,000,000 nuclei. What would be the…
A: The activity is R=11955.3677Bq
Q: A sample has a ¹4C activity of 0.0052 Bq per gram of carbon. (a) Find the age of the sample,…
A: The amount of carbon-14 in a living thing is constant. As a result of radioactive decays, carbon-14…
Q: 10.10. A sample of wood from an Egyptian mummy case has a specific activity of 9.41 d/min-g. How old…
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Q: The relatively scarce naturally occurring calcium isotope48 Ca has a half-life of about 2×1016 y .…
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Q: a sample with a half-life of 19 days has an initial activity of 7.0 x 10^5 counts/s. what isits…
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Q: Suppose the activity due to the radioactive decay of the carbon-14in a tiny sample of an artifact…
A: The activity of fresh wood sample is The activity of old wood sample is The half life of carbon 14…
Q: 2. Cs-137 source used in mining industry has an activity of 740 MBq as of March 30, 2000. What will…
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Q: A typical person of mass 65 kg contains 0.35% potassium, by weight. Of the potassium, 0.012% is 40K,…
A: Given: The mass of person is m=65 kg. The half life of nucleus is t1/2=1.28×109 y. The activity due…
Q: Question 6. At Canadian Light Source, a synthetie radioisotope is freshly prepared. The initial…
A: Given: The initial activity of synthetic radioisotopes is A0 = 10 mCi The activity changes after t =…
Q: While exploring a coal mine, scientists found plant fossils which had been preserved by an…
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Q: Radioactive tracers are used to study ion transport across cell membranes. The beta-minus emitting…
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Q: On your birthday, you measure the activity of a sample of 210Bi, which has a half-life of 5.01 days.…
A: Given Half life (T1/2)=5.01 days Initial activity (Ao)=1.000 μCi
Q: Suppose Radon gas is trapped in a basement after renovations. The half life of radon gas Is 3.8235…
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Q: 40.12 A sample of material contains 2.00 x 1015 atoms. The sample initially consists entirely of a…
A: Let N denote the number of atoms of the radioactive substance A. Let t1/2 denote the half-life time…
Q: Find the activity of a sample containing 1.63 10-6 g of (60/27)Co (T1/2 = 5.27 years).
A: As we know that the number 1 mole of mass of C2760o = 60gm…
Q: Find the activity of a sample containing 4.72 x 10-6 g of 60/27Co (T1/2 = 5.27 years)
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Q: Find the activity A of a sample containing 4E-6 g of 2760Co (T1/2 = 5.27 years). (Use 59.93 u as the…
A: Given: Weight, W =4.0×10-6 g Mass number, A = 59.93 u Avogadro number, NA = 6.022×1023 atoms/mol…
Q: A 5000-Ci ⁶⁰Co source used for cancer therapy is considered too weak to be useful when its activity…
A: Basic Details The ratio of the activity is an exponential function of decay activity and the time…
Q: Use the worked example above to help you solve this problem. The half-life of the radioactive…
A: Given data:T1/2=1.6×103 yrN0=3.41×1016 nucleiFirstly, converting half life into…
Q: A synthetic radioisotope is freshly prepared in a lab that has an activity of 10.0 mCi. If the…
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Q: What time interval elapses while 51.0% of the radioactivity of a sample of 7233As disappears, as…
A: As per given data, 51% of the radioactivity of a sample disappears.
Q: A sample of carbon of mass 6.74 g taken from an animal jawbone has an activity of 4.00 decays/min.…
A: Given that the 6.74 g of carbon taken from the jawbone. The no. of moles in 6.74 g of carbon be…
Q: 131I is a Beta - emitter used as a tracer for radioimmunoassay in biological systems. (a) Write the…
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Q: A purified sample of Mo-99 contains 370 million Bq. a. What mass does this represent if the…
A: It's a moderate-level question of radioactivity. It's a little bit confusing because 1st question…
Q: A 228Th source is labeled 1.50 mCi, but its present activity is found to be 3.47 ✕ 106 Bq. (a)What…
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Q: A. B. Use the worked example above to help you solve this problem. The half-life of the radioactive…
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Q: A small region of a cancer patient’s brain is exposed for 24.0 min to 475 Bq of radioactivity from…
A: Given: To find the dose in rads with the given values as,
Q: A sample contains 1.0 GBq of ⁹0 Sr and 0.62 GBq of ⁹0Y. (a) What will be the total activity of the…
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Q: Find the activity of a sample containing 8.53 1014 iodine-131 nuclei (T1/2 = 8.0 days).
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Q: A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 0.92-kg…
A: The initial activity of the sample can be obtained as R0=0.92×103 g15.0 decays/min11g=1.38×104/min
Q: (a) A wooden artifact is found in an ancient tomb. Its carbon-14 ( 14 c) activity is measured to be…
A: Known quantities:- Half life of carbon-14 (T1/2)= 5730 years Age of artifact is given by formula…
Q: The half-life of 43100Tc, a ß- emitter, is 15.8 s. a). How many atoms of 43100Tc are present in a…
A: Half life of decay = 15.8 Activity of sample = 0.2×10-6 = 3.7×1010 ×0.2×10-6 = 7400Bq
Q: The half-life of 27Mg is 9.50 min. initially there were 3.70× 1012 27Mg nuclei present. How many…
A: Given: The half-life of 27Mg t1/2 = 9.50 min At t=0, the number of nuclei of 27Mg, N0 = 3.70× 1012…
Q: The half life for the decay of carbon-14 is 5.73* 10^3 years. Suppose the activity due to the…
A: The half life for the decay of carbon-14 is 5.73* 10^3 years. A tiny sample of an artifact made of…
Q: The half-life of 231Pa is 3.25 × 104 years. How much of an initial 10.41 µg sample remains after…
A: Given that half life of 231Pa is 3.25* 10^4 year and initial amount of sample is 10.41microgram.…
Q: The C14 with an activity of 10 Ci is in a 1.0 mm thick lead box. Calculate the number of beta…
A: C14 has an activity of 10 Curie1 curie is defined as 3.7×1010 decays/sSo, 10×3.7×1010=37×101037×1010…
Q: A radioactive source emits 1800 α particles during an observation lasting 10 hours. In how many one…
A: This problem is based on probability, here the total number of events is 1800. The observation…
Q: A radioisotope has a half-life of 5.0 days. The activity of a radioisotope sample prepared ten days…
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