Calculate the radioactivity of 0.5mg of cobalt 56 in units of curie? Its radioactivity is 50 days, knowing that its half-life is equal to 78.5 days. If you know that the number of Avocadro is equal to 1023 x 6.02 mol / g
Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…
A: Given: The half life time of thorium is t1/2=1.405×1010 y. The mass of thorium in lantern is m=300…
Q: Sihle, an archaeologist from UWC finds an ancient wooden axe handle at an excavation site at…
A: Write the expression of decay rate. N=N0e-tt1/2
Q: Iodine-120 has a half life of 1.35 hours. If you start off with a sample which has an activity of…
A:
Q: In 1991, German tourists discovered the well-preserved remains of a man, now called “Ötzi the…
A: When scientists date a sample it is essential that the isotope which is used to date the sample…
Q: How much is the mass of the sample in grams of Po-218 that has an activity of 5.00 x 1019 Bq? The…
A: Given Activity = rate of disintegration = 5 × 1019 Bq = 5 × 1019 disintegration/second Half life =…
Q: Example (3) : 0.2 gram of pure potassium 40 ("K) emit about 10 beta rays per second .Estimate its…
A: Mass , m = 0.2 gm Atomic weight = 40 To find = Half life
Q: Plutonium-239 (t1/2 = 2.41x104 yr) represents a serious nuclear waste hazard. If seven half-lives…
A: Given that, The half-life of Plutonium-239 is t1/2 = 2.41 x 104 yr We need to find the time that…
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: The half-life of 231Pa is 3.25×104 years. How much of an initial 10.41 μg sample remains after…
A: Let the half life time of the sample is denoted by th. The formula for the disintegration constant…
Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…
A:
Q: The radionuclide 1311 Has a half-life of 100 hours. The activity of a m = 60mg of 1311 Is about: (N.…
A: Given: half life T1/2= 100 hours= 100*3600= 360000 sec we know that T1/2 = 0.693/λ λ is decay…
Q: Mantles for gas lanterns are made of thorium, because it forms an oxide that can survive being made…
A:
Q: 14. Iodine-131, a beta emitter, has a half-life of 8 days. A 2-gram sample of initially pure…
A: Note: Since you have asked multiple questions, we will solve the first question for you. If you want…
Q: Question : A water solution of the Tc-99m radiotracer has an initial radioactivity of 2 mCi/ml. The…
A: Given, Half-life of Tc-99m is t12=6 hr. Initial activity, A∘=2 mCi/ml. Time of activity, T=12…
Q: A living specimen in equilibrium with the atmosphere contains one atom of 14C (half-life = 5 730 yr)…
A: Determine the number of carbon molecules per mole. Determine the initial number of atoms of C-14.
Q: A living specimen in equilibrium with the atmosphere contains one atom of 14C (half- life = 5 730…
A: In this question we have to find out the age of the samole in the nearest year with the help of the…
Q: What is the binding energy per nucleon of 24 Pb? Give your answer in MeV
A: Mass defect of Pb is
Q: An artifact classified as charcoal, found in a site at Epirus, Greece, is found to have a 14C…
A: initial radioactivity(Ro)=0.255 counts per second final radioactivity(R)=4.36 X 10-2 counts per…
Q: A living specimen in equilibrium with the atmosphere contains one atom of 14C (half- life = 5 730…
A: Given: Half life time,t12=5730yr=5730×3.1536×107sMass of archeological sample of…
Q: A radioactive sample of 60Co (t₁/2 = 5.271 y) has a ß- activity of 4.4 X 107 Bq. How many grams of…
A: When the number of protons and neutrons inside a nucleus is not balanced some nuclei will become…
Q: A drug tagged with Tc (half-life= 6.05 h) is prepared for a patient. If the original activity of the…
A: Given:-Original activity (Ao)=1.1*104 Bq.Time (t) = 1.8 hoursHalf life = 6.05 hFind Activity…
Q: You are hired as an expert witness for the defense of an employee who is being sued for exposing his…
A: The initial number of oxygen atoms Half-life time, The time interval,
Q: The half-life of Pa 231 is 3.25 x 10"4 years. How much of an initial 10.40 micro-gram sample remains…
A:
Q: (DIFF:D)A living specimen in equilibrium with the atmosphere contains one atom of 14C (half-life = 5…
A:
Q: A 70-kg worker is accidentally exposed for 2.0 minutes to a 21-mCi source of beta radiation from a…
A: (a) Let M, T, and R denote the person’s mass, the time for exposure, and the radioactive sample’s…
Q: A solution of In-111 DTPA from the Amersham Corp. in Great Britain arrives in your department with…
A: The half-life of In-111 according to the chart of nuclides is…
Q: If 16 g of radon with a half-life of 4 days is present in a balloon at t = 0, what is the mass of…
A: Most of the nuclei present are unstable in nature. They try to gain stability by disintegrating…
Q: A semiempirical formula for the binding energy of a nucleus of atomic number Z and mass number A is…
A:
Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…
A: Hlf-life time of radioactive element is Mass of element is Note:Molar mass of is Avogadro's number…
Q: The half-life of iodine-131 is 8 days. How long does it take for the initial activity of 4500 kBq /…
A: half life of iodine 131 = 8 days Initial activity (Ao) = 4500 kBqm3Final activity (A) = 65 kBqm3
Q: The counting rate from a radioactive source is 4000 counts per second at time t=0. After 10 seconds,…
A: We know that activity is N=N0e-λt and T1/2=ln2λ=0.693λ Using the above formula the problem can be…
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 scientist is studying a 2.234 g sample of thorium-229 (t1/2 = 7340 yrs) in a laboratory. (a)…
A: The mass of the thorium is 2.234 g.The half-life time of the thorium is 7340 years.
Q: A living specimen in equilibrium with the atmosphere contains one atom of 14C (half- life = 5 730…
A: In this question we have to find the age of the given sample in the nearest year. Please give…
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) The ionic radius of lead is 0.180 nm. What fraction of this volume does the nucleus take up for…
A:
Q: a) in ten days the radioactivity of cerium-141 is reduced by 19.3%. what is the half time?(-…
A: What is the half life of cerium-141?given,Radioactivity decreases by 19.3%time(t)=10 days=8.64×105 s
Q: A living specimen in equilibrium with the atmosphere contains one atom of ¹4℃ (half-life = 5 730 yr)…
A:
Q: A 60-kg person accidentally ingests a small source of alpha particles (RBE=15). The activity of the…
A:
Q: 1. Consider cobalt-60 (60Co) with a half-life of 5.25 years. How many years will it take for its…
A: Given, Half life of Co-60 is 5.25years
Q: building has become accidentally contaminated with radioactivity. The longest-lived material in the…
A: Answer is 1685.2 years
Q: Substance X has a half-life of 10 years, if you start with 1000 grams, how much will be left after…
A: Given data: Half life (t1/2)= 10 years Initial quantity (N0) = 1000 grams Time (t) = 100 years…
Q: A radioisotope has a half-life of 5.0 days. The activity of a radioisotope sample prepared ten days…
A:
Q: The remains of an ancient cave were unearthed. Analysis from charcoal in the cave gave 12.0…
A: Half life is defined as the interval of time required to decay half of the nuclei of radioactive…
Step by step
Solved in 2 steps