Find the half-life of a material that has a decay constant of 2.20 x 10-8 s-1.

Q: Question 4. A synthetic radioisotope is freshly prepared in a lab that has an ac- ivity of 10.0 mCi.…

A: Given data as per question t    =   5.00 h A0  =   10.0mCi

Q: A freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After 4.00…

A: Formula to calculate the decay constant is,

Q: You have a 5.2 mol pure sample of an unknown material. After 1.2 h, you discover that 56% has…

A: Given that                    The initial number of the moles of the sample is No = 5.2mol Since…

Q: a) Natural potassium contains 40K , which has a half-life of 1.277×109 years. What mass of 40K in a…

A: a) The number of radioactive nuclei is,

Q: If a 3.16-g sample of an isotope having a mass number of 135 decays at a rate of 0.530 Ci, what is…

A: Given Mass of Isotope = 3.16 gram = 3.16×10-3 Kg Mass Number = 135  Rate of decay = 0.530 Ci As…

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: Calculate the mass of a sample of (initially pure) 40K that has an initial decay rate of 1.70 * 105…

A: The initial decay rate,

Q: A 10-kg suitcase is placed on a scale in an elevator that is moving upward. Which of the following…

A: Given, mass of suitcase is, M=10kg and Lift is moving upward,   Apparent weight: The apparent weight…

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: 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: The activity of a sample of a radioisotope at some time is 10.5 mCi and 0.46 h later it is 7.00 mCi.…

A: Initial activity of isotope is Ro = 10.5 mCi Activity after some time is R = 7.00 mCi Time elapsed…

Q: U235 has a decay constant of 3.138 × 10-17 s-1. Activity of 1 ug of the sample will be 80.386×10-3…

A: Unstable nuclei become stable by radiating energy. This process is called radioactivity. The rate at…

Q: Protactinium has a half life of 3.28 x 104 years. Estimate the decay constant.

A: Most of the heavy nuclei will undergo decay to become stable by reducing the number of neutrons or…

Q: The carbon–14 activity in papyrus growing along the Nile River today is 231 decay events per…

A: Name of element Carbon 14 Decay events per kilogram of papyrus = 231 Decay events per kilogram of…

Q: Plutonium-238 (238Pu) is a radioactive isotope with a half-life of 87.7 years. If a sample of 238Pu…

A: Given Half life=87.7year Activity after the=438.5year

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: he half-life of 27Mg is 9.50 min. Initially there were 3.70 × 1012 27Mg nuclei present. How many…

A:

Q: The common isotope of uranium, 238U, has a half-life of 4.47 * 109 years, decaying to 234Th by alpha…

A: Part (a) Given: The half-life of Uranium is t1/2=4.47×109 y. The activity of Uranium is A1=1.00 Ci.…

Q: An ancient rock is obtained from an excavation inside a mine. It is found that the ratio of the…

A: The formula of the radioactivity is  N =  No e-λ t where, N is the left over atoms, No is the…

Q: Natural potassium contains 40K, which has a half-life of 1.277 ✕ 109 y. What mass (in g) of 40K in a…

A:

Q: The half-life for the a decay of uranium 2U is 4.47 x 10° yr. Determine the age (in years) of a rock…

A:

Q: a) What is the decay constant of fluorine-17 if its half-life is known to be 66.0 s? = b) How long…

A: Given value---  Half life time of F-17 (t 1/2) = 66 sec. We have to find---  What is the decay…

Q: A certain isotope has a half-life of 5.9 h and an atomic mass of 95.98 u. What will the activity in…

A:

Q: At t=0 s, you have a pure sample of an unknown substance. At t = 948 s, 36.8% of the substance…

A: we know, If N0 be the initial sample at t=0 sec and after t sec N is remains then,…

Q: The half-life of beryllium-7 is about 53.3 days. (a) Determine the decay constant for beryllium-7.…

A: Given value--- Half life time = 53.3 days. We have to find--- (a) Determine the decay constant…

Q: Natural potassium contains ⁴⁰K , which has a half-life of 1.277×10⁹ years. What mass of ⁴⁰K in a…

A:

Q: You have an isotope with a decay constant of 2.48 x 10-3 s-1. What is the half-life of this isotope?

A:

Q: There is more than one isotope of natural uranium. If a researcher isolates 0.7 mg of the relatively…

A: