A radioactive sample with a half-life of 9.4 s initially has 2,000,000 nuclei. What would be the activity, or decay rate, in Bq after 7.6 seconds?
Q: The decay constant of 235U is 9.8×10^−10 y^−1 . How many 235U atoms will remain in a 1.0 µg sample…
A:
Q: The half-life of 131I is 8.04 days. c) Convert 0.550 ?Ci to the SI unit the becquerel. (d) Find…
A: c) one curie is 3.7 x 1010Bq converting 0.05 micro curie we get, 0.05 μCi = 0.05 x 10-6 x 3.7 x…
Q: Ruthenium-106 (106 Ru) is used to treat melanoma in the eye. This isotope decays by ẞ emission with…
A: Approach to solving the question: Detailed explanation:Examples: Key references:
Q: A freshly prepared sample of a certain radioactive isotope has an activity of 3,7 × 1011 decays/s.…
A: Given quantities: initial activity of the isotope (A0) = 3.7 × 1011 decays/s activity of the isotope…
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…
A:
Q: A radioactive sample has an activity of 250 Bq and contains 6.52×10¹³ radioactive nuclides. Estimate…
A: The rate at which this decay takes place in a given sample of radioactive material is called its…
Q: For a fission reaction, 1.92 x 1016 J of energy is released. What is the mass defect in kg?
A:
Q: Chromium's radioactive isotope 5'Cr has a half-life of 27.7 days and is often used in nuclear…
A: from the given information,
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: 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: What is the half-life of an isotope that decays to 6.25% of its original activity in 60.2 h?
A:
Q: a sample containing l-131 has an activity of 6.4x10^8 Bq.h how many days later will the sample have…
A:
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: 4⁰K is an unusual isotope, in that it decays by negative beta emission, positive beta emission, and…
A: Q value for a reaction is the amount of energy absorbed or released during the nuclear reaction. The…
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: You measure the decay rate of a radioactive sample to be 4.225 x 101 Bq. After 139 seconds, the…
A:
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: In a piece of rock from the Moon, the Rb content is assayed to be 1.89×1010 atoms per gram of…
A:
Q: 40K is an unusual isotope, in that it decays by negative beta emission, positive beta emission, and…
A: As per the mass-energy equivalence principle, energy and mass are interconvertible. Thus when energy…
Q: A nuclei has a half-life of 2.80 days. If 122 mCi were prepared but had a delay of 8.0 days. How…
A:
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: The half-life of 60?? is 5.27 years. The activity of a 60?? is 3.50 × 109 Bq. What is the mass of…
A:
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: 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: What is the activity of a sample of C that contains 6.7x1020 nuclei? The half-life of C is 5700…
A: Solution:In 5700 years 6.5 × 10202 nuclei decay will take place, thus we have:5700 yrs =…
Q: 0.1 mg of pure 23ºPu (emitting Alpha particles) was found to decay with an activity of 1.38 x 107…
A:
Step by step
Solved in 3 steps with 3 images
- A certain isotope has a half-life of 5.9 h and an atomic mass of 95.98 u. What will the activity in Bq of a 1.36-g sample be after 19.8 h?In many cases, prostate cancer is treated by implanting 60 to 100 small seeds of radioactive material into the tumor. The energy released from the decays kills the tumor. One isotope that is used (there are others) is palladium (103Pd) with a half-life of 17 days. If a typical grain contain 0.27 g of 103Pd, (a) what is its initial activity in Bq and (b) what is the activity 68 days later?What is the activity (in particles/s) of a sample of Carbon-14 that contains 9.070E+21 nuclei?
- A sample of radioactive isotope is found to have an activity of 110 Bq imediately after it is pulled from the reactor that formed the isotope. Its activity 1 h, 20 min later is measured to be 89 Bq. Find the decay constant of the sample. Answer in units of h-. Find the half-life of the sample. Answer in units of h. How many radioactive nuclei were there in the sample initially?Chromium's radioactive isotope 51Cr has a half-life of 27.7 days and is often used in nuclear medicine as a diagnostic tracer in blood studies. Suppose a 51Cr sample has an activity of 2.36 µCi when it is placed on a storage shelf. (a) How many 51Cr nuclei does the sample contain? Answer:__________ nuclei (b) Calculate the sample's activity in Bq when it is removed from storage one year later. Answer:____________Bq⁵⁰V has one of the longest known radioactive half-lives. In a difficult experiment, a researcher found that the activity of 1.00 kg of ⁵⁰V is 1.75 Bq. What is the half-life in years?
- The radioactive nuclide plutonium 199 has a half life of 43.0min.A sample is prepared that has an initial activity of 7.56 x 10^11Bq i.How many plutonium 199 nuclei are initially present in the sample ii. What is the activity at this timeThe half-life of 30P is 2.50 minutes. If a sample of 30P has 1.60 x 1010 nuclei present initially, after 10.0 minutes how many remain?There is more than one isotope of natural uranium. If a researcher isolates 0.7 mg of the relatively scarce 235U and finds this mass to have an activity of 78.0 Bq, what is its half-life in years? =___years
- The decay chain of uranium includes radon, a noble gas. When uranium in the soil decays to radon, it may seep into houses; this can be a significant source of radiation exposure. Most of the exposure comes from the decay products of radon, but some comes from alpha decay of the radon itself. If radon in the air in your home is at the maximum permissible level, the gas in your lungs will have an activity of about 0.22 Bq. Each decay generates an alpha particle with 5.5 MeV of energy, and essentially all that energy is deposited in lung tissue. Part A Over the course of 1 year, what will be the dose equivalent in Sv to the approximately 0.90 kg mass of your lungs? Express your answer in millisieverts per year. ΕΧΕΙ ΑΣΦ dose equivalent = ? mSv/yrWhat is the half -life of potassium-40 if 1.70×10^19 nuclei have an activity of 300 BqYou measure the decay rate of a radioactive sample to be 4.225e11 Bq. After 139 s, the decay rate is a quarter the initial rate. a) what is the half-life of the sample? b) how many nuclei were in the sample initially?