The half-life of polonium is 139 days, but your sample will not be useful to you after 94% of the radioactive nuclei present on the day the sample arrives has disintegrated.  For about how many days after the sample arrives will you be able to use the polonium?   The polonium sample can be used for approximately ___ days.

Q: From the following numbers of protons and neutrons in the nucleus, choose the symbol for the…

A:

Q: One of the dangers of radioactive fallout from a nuclear bomb is its 90Sr, which decays with a…

A: The expression for the required ground area is,

Q: How many nuclei of a radioactive substance of half life 1 year will decay in five years assuming…

A: Given data:  Half life = 1 year Time (t) = 5 years The original number of nuclei (N0) = 2048…

Q: Determine the half-life (in s) of a radioactive sample that has a decay rate of 4.70 x 1011 Bq when…

A: Given : Decay rate = 4.70 × 1011 Bq             Nuclei = 1.70 × 1015

Q: The probability that a randomly chosen nucleus in a radioactive sample will have decayed in a given…

A: Sample of radio active nucleus decayed = 96.875 %

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

A:

Q: Two radioactive samples, X, Y have the same number of atoms at t = 0. Their half lives are 3h and 4h…

A: The formula of the radioactivity is  R = Ro e-0.693 tT where, Ro is the initial activity, t is the…

Q: An unknown radioactive element decays into non-radioactive substances. In 360 days the radioactivity…

A:

Q: In which of the types of decay does a proton turn into a neutron like the one shown below? A: +beta…

A:

Q: What fraction of a radioactive sample is left after exactly 6 half lives? Give your answer to 3…

A: Number of half life (n) = 6

Q: A radioactive sample contains 3.50ug of pure 11/6 C. The half-life of 11/6 C is 20.4 minutes (take…

A:

Q: The radioactive isotope (95 Nb) has a half-life of 35 days. A sample containing this isotope has an…

A: Let the half -life of the isotope be denoted as t1/2 .The expression for the decay constant λ in…

Q: The radioactive isotope (95Nb) has a half-life of 35 days. A sample containing this isotope has an…

A: Half life , T12 = 35 days =35 x 24 = 840 hours  Initial Activity , A0 = 4.5 x 108 Bq T1 = 36 hours…

Q: 3. The radioactive isotope (Nb) has a half-life of 35 days. A sample containing this isotope has an…

A: Let the given radio active decay be represented as N=N0e-λt…

Q: he isotope neptunium-229 ( 229 93Np) undergoes alpha (4 2He) decay. Write the reaction equation and…

A:

Q: 4. A radioactive sample, with an initial mass of 28 mg, has a half - life of 5 days. What is the…

A:

Q: The half-life of 131 I is 8.04 days. (a) Convert the half-life to seconds. (b) Calculate the decay…

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…

Q: QI: A hospital technician is working with a radioactive source. The graph below shows the activity…

A: The given graph is shown below

Q: When a nucleus decays by emitting an alpha particle, what is the atomic number of the resulting…

A: Given: 88 Ra226

Q: Radioactive Decay Part A: Rank the samples on the basis of their half-life. (Largest to smallest)…

A:

Q: Bismuth-214 (214BI) is unstable with a half-life of 5 days and decays into polonium-214 (21P0),…

A:

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

A: a)

Q: The formation of helium nucleus, from the fusion process of two deuterium nudei is shown as below:…

A: For the following problem, we have to select the best alternative for true statement.

Q: Two radioactive nuclei, A and B have the same amount at the beginning. After 15 days, the number of…

A: The half life of B is longer than A.

Q: In a sample of radioactive material, what percentage of the initial number of active nuclei will…

A: Concept and Formula -                               let, initial no of active nuclei = N0…

Q: 38 Which statement explains the meaning of the half-life of a radioactive substance? A half the time…

A: Every radioactive substance has a characteristic property which is independent of the amount of…

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: Which of the following is the process where the unstable nucleus loses energy by emitting radiation?…

A:

Q: Answer the following questions regarding the radioactive isotope radium-226. A.Write a nuclear…

A: Given, Radium isotope Ra-226

Q: The radioactive isotope (Nb) has a half-life of 35 days. A sample containing this isotope has an…

A: Write the expression for the decay constant.

Q: The radioactive isotope 198Au has a half-life of 64.8 h. A sample containing this isotope has an…

A: Given data: The half -life of A198u is T1/2 =64.8 h The initial activity of the sample ,A =40 μCi…

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

A: The initial activity is given by,

Q: Natural gold has only one isotope, 79197Au. If gold is bombarded with slow neutrons, e- particles…

A: (a)The reaction corresponding to the given problem is.

Q: State which of the following statements are true and which are false: a)  After two half-lives, all…

A: NOTE: As per guidelines, I can solve first question. If you need help with other questions kindly…

Q: Magnesium (12Mg) has three stable isotopes with consecutive mass numbers. Write the complete nuclear…

A: An element’s Isotopes are the variant of the element with the same atomic number or the protons…

Q: The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years. Suppose you have a…

A: It is given that the initial number of atoms of cobalt-60 and strontium-90 are equal. The half-life…

Q: Identify the type of radioactive decay in the following reaction: 219 Ra → 219 Ac + e +v 88 -1 O…

A: An element X is represented by   Az X Here,  A = mass number, z = atomic number. In the case of…

Q: The oceans have a volume of 317 million cubic miles and contain 1.32 × 1021 kg of water. Of all the…

A: a. the number of water molecule is Then the number of deuteron is

Q: View image

A: The decay constant is

Q: Does the number of radioactive nuclei in a sample decrease to exactly half its original value in one…

A: The number of nuclei at a given instant of time can be given as We know,

Q: State which of the following statements are true and which are false: a) After two half-lives, all…

A: Given:Statements are true and which are false.A) After two half-lives, all radioactive nuclei in a…

Q: As shown how the number of nuclei of one particular isotope varies with time. What is the halflife…

A: Given data The initial number of nuclei is No=1000000 The nuclei after time t is N=250000 The time…

Q: Initially, a particular sample has a total mass of 360 grams and contains 512 x 1010 radioactive…

A:

Q: At time t = 0, a radioactive sample contains 3.50 mg of pure 11/6C, which has a half-life of 20.4…

A: Given: The mass is m=3.5 mg. The half life is t=20.4 min. Part (A) The expression for number of…

Q: Tritium has a half-life of 12.33 years. What fraction of the nuclei in a tritium sample will remain…

A:

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.