Measurements on a certain isotope tell you that the decay rate decreases from 8318 decays/min to 3091 decays/min in 4.00 days. What is the half-life of this isotope?

Q: Francium -223 has a half- life of 21.80min. how many nuclei will be present 1hr and 49min later?

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Q: λ =

A: Deacy of an unstable atom is defined by the radioactive decay law. It states that the probability…

Q: A radioactive isotope has an initial activity of 8000 decays per second (dps). If its half-life is…

A: In radioactive decay, the number of radioactive atoms and their activity decrease over time.The…

Q: Your lab has been given a radioactive sample and you determine that the decay constant is 3.00 x…

A: The activity of a radioactive sample R is where  is the decay constant and N is the number of…

Q: Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from…

A:

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: How many half-lives would it take for 6.02×10 ^23 nuclei to decay to 6.25%(0.376×10^23) of the…

A: Initial no. Of nuclei( No)  =6.02×1023 Final no. Of nuclei(N)=0.376×1023 ;(6.25% of initial no. Of…

Q: A sample of radioactive nuclei has N0 nuclei at time t = 0. The half-life of the decay is T1/2. In…

A: Activity is, R=-∆N∆t

Q: Calculate the binding energy (in MeV) per nucleon for an α-particle (4He nucleus), given that the…

A: Since you have asked multiple questions we will solve first question for you.please post remaining…

Q: A radioactive sample with a half life of 4.8 weeks has 3.05e+15 nuclides present in the initial…

A:

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: Radon-222 has a half-life of 3.8 days. What mass of radon-222 would have a decay rate of 2220 Bq?…

A: We use the formula of rate of decay to get the required values.

Q: The decay constant of a radioactive source is 752 per year. Then its half- life equals: *

A: Step:1   The  Time  taken  for a radioactive atom    to  disintegrate  to half  of its  original…

Q: radioactive sample initially undergoes 12.0×10^4 decays/s. Twenty-four hours later, its activity is…

A:

Q: radioactive

A: Given: The remaining sample = 0.004 of the original value

Q: A radioactive sample has a decay constant of 0.2193/min. (a) What is its half-life? (b) If at the…

A: The equation of the radio activity is given by  N = No e-λt where, N is the number of atoms left, No…

Q: The half-life of the radioactive nucleus 226 88Ra is 1.6 ᵡ 103 yr. If a sample initially contains…

A: The expression for the decay constant(λ) is given as, λ = ln 2t1/2, where t1/2 is the half-life…

Q: The cesium isotope 137Cs is present in the fallout from aboveground detonations of nuclear bombs.…

A: Radioactivity is the process of decay of a nucleus into another nucleus, by emitting alpha, beta or…

Q: Radioactive 214^83 Bi has a half-life of 19.9 min if the activity of the radionuclide 1.2 hours…

A:

Q: Consider the α decay 92U143→ 90Th141+2He2.     Part (a) What energy, in megaelectron volts, is…

A: Consider the α decay 92U143→ 90Th141+2He2.

Q: A heavy nucleus X of mass number 240 and binding energy per nucleon 7.6 MeV is split into two…

A: Given: The mass number of nucleus X is MX=240. The binding energy per nucleon of nucleus X is…

Q: Iodine ( A= 131, Z= 53 ) undergoes a β- decay. What is the resulting daughter nuclide?

A: Parent nuclide : Iodine A = 131 Z = 53 Decay mode = beta negative decay

Q: Derive an approximate relationship between the energy of α decay and half-life using the following…

A: Given,

Q: What is the nuclear binding energy for a mole of hydrogen (H-1), whose mass is 1.00794? (mass of a…

A: The binding of one hydrogen atom can be determined as, Here, Δm, mp, mH, and c represent the mass…

Q: Problem 9:  235U is the rarer of the two most common uranium isotopes. Most uranium is 238U.…

A: a)

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.90 billion years old by…

A: Given, Half-life of U238 is 4.47 ×109 years

Q: A radioactive sample has a decay constant of 0.219 3/minute. (a) What is its half-life? (b) If at…

A: The relation between the half life and the decay constant is  T = 0.693λ The equation of…

Q: If it is known that 87% of an initial radioactive sample remains after 3 days, what is the decay…

A: Given: The amount of radioactive decay is 87% of the initial amount. The time is 3 days.

Q: The radioactive isotope Gold-198 has a half-life of 64.80 hrs. A sample containing this isotope has…

A: The value of decay constant is,

Q: What is the half-life of an isotope that decays to 6.25% of its original activity in 24.2 h?…

A:

Q: The isotope 208 Tl undergoes B-decay with a hal min. What is the decay constant for 208 Tl?

A: Givent1/2=3.1 min