A radioactive sample has an activity R. For each of the following changes, indicate whether the activity would increase, decrease, or remain unchanged. Indicate your answers with I, D, or U. (a) The number of radioactive nuclei in the sample is doubled. (b) The half - life of the radioactive nuclei is doubled. (c) The decay constant is doubled. (d) A time period equal to two half - lives is allowed to elapse.

Q: Suppose that you start with 3.65 g of a pure radioactive substance and determine 19.6 h later that…

A:

Q: Suppose the decay constant of radioactive substance A is twice the decay constant of radioactive…

A: Given: Decay constant of A = 2× decay constant of B Half-life of B = 3 h.

Q: A radioactive isotope has a half-life of 72.0 min . A sample is prepared that has an initial…

A: (a) Initial radioactive nuclei

Q: The Curiosity rover sent to explore the surface of Mars has an electric generator powered by heat…

A: The expression for half-life of plutonium is Here, λ is disintegration constant. Substitute the…

Q: please answer D 2. Caesium-137 decays via β - emission with a half-life of 30.17 years. A sample is…

A:

Q: A radioactive isotope has an activity of 9.27x104 Bq initially. After 3.30 hours the activity is…

A:

Q: What is (a) an alpha particle? (b) a beta particle? (c) a gamma ray? (d) an X-ray? (e) a daughter…

A: Given : To explain each term.

Q: A sample of the radioactive nuclide 199Pt is prepared that has an initial activity of 7.80×1011 Bq…

A: a) We know ,   half life t12=t ln2ln NoNtinitial activity = 7.8x1011next activity = 9.45x1010

Q: The beta decay of 40K that is a natural part of the body makes all human beings slightly…

A: Given,             Beta decay of 40 K             70 kg adult have potassium = 170 g…

Q: A radioactive isotope has an activity of 9.34×104 Bq initially. After 3.10 hours the activity is…

A:

Q: (a) the initial activity in curies | µCi (b) the number of radium nuclei remaining after 4.3x10 yr…

A: Step:1∙The half  life of radioactive  nucleus  22688Ra  is 1.6×103year∙Initial  No. of  nuclei…

Q: A student carries out a radioactive decay experiment. She measures the activity of a source as a…

A: Given: The activity of the substance is given as below. Rt=714e-0.41×t…

Q: 2. Calculate the activity due to 14C in 1.00 kg of carbon found in a living organism. Express the…

A: The given values are,

Q: (b) The results of activity measurements on a radioactive sample are given in the Table. i) Find the…

A:

Q: purchased by a medical supply house. If the sample has a half-life of 14 d, how long will it keep…

A: Just replace the values .... An its done

Q: The shroud of Turin, which shows the negative image of the body of a man who appears to have been…

A: Given: The half-life of carbon-14 is 5,730 years, but we need to calculate the value of the k

Q: Suppose a radioactive nucleus has a half-life of 2 min. and suppose the counting rate at time t = 0…

A: Since you have posted a question with a multiple sub parts, we will solve first three sub - parts…

Q: Calculate the activity due to 14C in 1.00 kg of carbon found in a living organism. Express the…

A: The formula of activity is,

Q: a) The activity of a radioactive source is given by dN AN dt where N is the number of nuclei present…

A: A) The activity of a radioactive source is given by : -dNdt = λN initial number of nuclei = No at t…

Q: Both 1) Equation for a radioactive decay of a nucleus is  dNdTdNdT=−??. Given decay constant is λ =…

A: The question is regarding radioactive decay of the nucleus and half life.

Q: At present, concentration of  92235U  in naturally occurring uranium deposits is approximately 0.7…

A: Concentration after 1.7 billion year is = 0.13%

Q: The activity (or decay rate) A of a certain unknown radioactive sample was measured over a period of…

A: Given:

Q: A radioactive material has a decay constant of λ = 0.0586 yr-1. If it starts out with N0 = 9.03 ×…

A: Given: Decay constant : λ=0.0586 yr-1 N0=9.03×1018 t = 407 years To find N left after given t years.

Q: The rate at which radioactive nuclei decay is proportional to the number of such nuclei that are…

A: Given, half life period  t1/2= 1000 year

Q: Francium-223 has a half-life of 21.80 min. How many nuclei are initially present in a 25.0-mg sample…

A:

Q: A radioactive isotope has a half-life of 72.0 min. A sample is prepared that has an initial activity…

A: Given Data: The half-life of a radioactive isotope is, t1/2=72.0 min The initial activity is,…

Q: what type of radioactive source would you use to treat deep-seated brain tumors-alpha , beta, or…

A: To explain : The type of radioactive source used to treat deep-seated brain tumors

Q: The decay rate N, for N number of radioactive nuclei is dt -AN What is meant by higher decay…

A: Given data,

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

A:

Q: A rock contains 0.257 mg of Pb-206 for everv milligram of U-238.The half-life for the decay of U-238…

A:

Q: Y When the daughter nucleus produced in a radioactive decay is itself unstable, it will eventually…

A: Disclaimer: “Since you have asked multiple question, we will solve the first question for you. If…

Q: (a) The daughter nucleus formed in radioactive decay is often radioactive. Let N10 represent the…

A: For the first-order reaction, the rate of radioactivity is directly proportional to the number of…

Q: d) A radioactive source has an activity of 3.6x107 Bq due to the decay of a radioisotope with a…

A:

Q: An unstable isotope of cobalt, 60Co, has one more neutron in its nucleus than the stable 59Co and is…

A: Given Data The half-life of the isotope is T1/2 = 5.3 years. The mass of the cobalt is m = 4.20×10-2…

Q: What fraction f1 of a radioactive sample will be left after 3 half‑lives? f1 = ? What fraction f2…

A:

Q: How many half-lives would it take for a sample of a radioactive isotope to decrease its activity to…

A:

Q: RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: 1 Ci = 3.7 × 101º Bq 1. Nuclear decay law: N…

A:

Q: Two nuclei have mass numbers in the ratio 1: 8. What is the ratio of their nuclear radii?

A: The relation between the mass number and the radius is  R =Ro A13 where, Ro is constant, R is the…

Q: State the law of radioactive decay. Plot a graph showing the number (N) of undecayed nuclei as a…

A: The law of radioactive decay: "The number of nuclei undergoing radioactive disintegration per unit…

Q: The decay rate of a radioactive sample decreases from 161 kBq to 22.3 kBq in 16.4 s. What is the…

A: Initial size of the sample is Ro = 161 kBq Final size of the sample is R = 22.3 kBq Time taken is t…

Q: The amount of radioactive 40K in a 70kg person is approximately 5000Bq. A) what is the number (N) of…

A: mass of person (m) = 70 kg Activity (A)  = 5000 Bq Half life of K40 = 1.25×109 years

Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.