A radioactive sample has a half-life of 3 days. Its current activity is 100 μCi . What was its activity 6 days ago?

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…

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Q: A 44.5 g sample of carbon has an activity of 8.55 decays per second. How old is it? Please give your…

A: Given data The mass of the sample of carbon is given as m = 44.5 kg.  The number of decays is given…

Q: he isotope of Curium 242Cm has

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Q: A sample of radioactive material contains 1x 1014 atoms and has an activity of 6.3 x 1011 Bq. What…

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Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A: According to the data given Half life is 3hr And relationship given is . N(t) = N0 e(-t/£)

Q: Strontium is chemically similar to calcium and can replace calcium in bones. The radiation from ⁹⁰Sr…

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Q: The radioactive isotope 234pa has a half-life of 6.70 h. A sample containing this isotope has an…

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Q: a sample with a half-life of 19 days has an initial activity of 7.0 x 10^5 counts/s. what isits…

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Q: The half life of 238 U against a-decay is 92 238 U having 92 1.5 x 10 s. What is the activity of a…

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Q: Gamma rays may be used to kill pathogens in ground beef. One irradiation facility uses a 60Co source…

A: The total amount of energy of gamma rays per beta decay of 60Co can be given as, Here, ε represents…

Q: The isotope of Curium 242Cm has a half-life of 160 days and emits alpha particles with an energy…

A: Solution:-

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: Some nucleus of ¹9X (atomic mass = 189.96182 u) undergoes - decay to become ¹2X1 (atomic mass =…

A: The mass of the parent nucleus is 189.96182 u. The mass of the daughter nucleus is 189.95844 u.…

Q: What is the half-life in days of a radioactive sample with 3.0x1015 atoms and an activity of 6.2x108…

A: In this problem, we are given the number of atoms in a radioactive sample (N = 3.0x10^15 atoms) and…

Q: alf-life of this sample?

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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 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: 3. A drug prepared for a patient is tagged with Tc which has a half life of 6.05 h and an activity…

A: Write the expression for the activity. A=A0(12)tt1/2 Here, A is the final activity after time t, A0…

Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…

A: Hlf-life time of radioactive element is Mass of element is Note:Molar mass of  is Avogadro's number…

Q: In a piece of rock from the Moon, the Rb content is assayed to be 1.89×1010 atoms per gram of…

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Q: A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 0.8 kg sample…

A: Approach to solving the question: Detailed explanation: Examples: Key references:

Q: A radioactive material produces 4.386E+3 decays per minute at one time, and 7.57 h later produces…

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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: Problem 8:  In a living organism, a fixed fraction 1.30 × 10-12 of 12C is the radioactive isotope…

A: Given data: fixed fraction =1.30 × 10-12 of 12C Need to determine the numeric value is expected.

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…

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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…

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Q: A radioactive sample with a half-life of 5.3 weeks has 1.04e+15 nuclides present in the initial…

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Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A: Radioactivity

Q: unlabeled container of radioactive material has an activity of 78 decays/min. Four days later the…

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Q: 1.The isotope Tc", which has a hali-ife of 6.0 h, is used in medical diagnosis procedures such as…

A: 1. Given, Half-life, t1/2=6h Sample activity, A0=32mCi Time, t=9h So, activity after 9hours, A=A0…

Q: A wood artifact discovered in 1990 showed a 14C-activity equivalent to 43% of that found in the…

A: Given : Half life of C-14, t1/2 = 5730 years Let initial count of C-14 be N = 100 The count of C-14…

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…

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Radioactive decay

The emission of energy to produce ionizing radiation is known as radioactive decay. Alpha, beta particles, and gamma rays are examples of ionizing radiation that could be released. Radioactive decay happens in radionuclides, which are imbalanced atoms. This periodic table's elements come in a variety of shapes and sizes. Several of these kinds are stable like nitrogen-14, hydrogen-2, and potassium-40, whereas others are not like uranium-238. In nature, one of the most stable phases of an element is usually the most prevalent. Every element, meanwhile, has an unstable state. Unstable variants are radioactive and release ionizing radiation. Certain elements, including uranium, have no stable forms and are constantly radioactive. Radionuclides are elements that release ionizing radiation.

Artificial Radioactivity

The radioactivity can be simply referred to as particle emission from nuclei due to the nuclear instability. There are different types of radiation such as alpha, beta and gamma radiation. Along with these there are different types of decay as well.