____17. When an atom is a gamma ray emitter, the atom releases: ________________.  ____18. The time it takes for the unstable nucleus to cut its mass by half is called: _____________.  ____19. A nucleus that decays spontaneously by emitting an electron or a positron (a positively charged particle with the mass of an electron) is said to undergo: A. beta decay B. alpha decay C. gamma decay ____20. A nucleus with longer half-life is: A. non-reactive B. less radioactive

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

A:

Q: 3. What is the energy released in this nuclear reaction Be + H → 10Be+H? (The atomic mass of 2Be is…

A:

Q: A radioactive material initially is observed to have an activity of 1000 decays per second. If 9.0…

A: Given : A0 = 1000 decays/sec A = 100 decays/sec t = 9 hours

Q: 2. An isotope of sodium 24N a has a half-life of 15 hours. A sample of this isotope has a mass of…

A:

Q: 3. A nucleus with 64 nucleons (33 of which are neutrons), undergoes beta-negative decay. The…

A:

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: 5. How many nuclei of 238 U remain in a rock if the activity registers 270 decays per second? (Note…

A:

Q: A man, whose lungs are on average filled with 1 liter of inhaled air, lives in a house with a radon…

A: Given(s): Average inhaled air= 1 lit. Radon gas activity, A=1.0 x10-12 Curie/liter. Require:…

Q: A radioactive isotope decays by ß- emission. a) i What is radioactive decay, and how is it related…

A: Atoms consist of a nucleus composed of protons and neutrons, surrounded by electrons. The stability…

Q: How can an electron be ejected from a nucleus in beta decay if it wasn't in the nucleus to begin…

A: since protons are positive and electrons are negative so, when they form neutron ,the charge is…

Q: 3. Decay of a radioactive material takes place according to the data given in Table 2. Find the…

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Q: What change occurs to the atomic number and mass of a nucleus during each of the following decay…

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Q: Radioactive decay: A certain substance has a half-life of 5.0 hours. How many nuclei of the…

A: Recall that the activity of a radioactive substance is defined as follows:A=λNWhere:- A is the…

Q: 17. Home smoke detectors often contain the radioactive element Americium-241 which emits a particles…

A: Step 1: a) Americium-241 emits alpha particle and forms Neptunium-237.An alpha patircle is…

Q: Consider the Deuterium-Tritium fusion reaction ²H +³H → ˆHe+n How much is the energy released per…

A: Standard values:

Q: What is the nuclear equation for 0 Th (alpha decay)? a. 00 Th 86 230 Ra + He > b. 232 Th 90 Ra + He…

A:

Q: 1. Complete the following chart. Name # of Protons # of Electrons # of Neutrons Mass 15 Silver 110…

A: 1) to complete the following chart on the based on atoms of different elements

Q: Radioactivity Basics: When a ß particle is emitted from an unstable nucleus, the atomic number of…

A:

Q: Iodine-131, a beta emitter, has a half-life of 8 days. A 2-gram sample of initially pure iodine-131…

A:

Q: Living matter has 1.3 x 10-10 % of its carbon in the form of C-14 which has a half-life of  5730 yr.…

A:

Q: 7. If the mass of the products in a fission reaction is 3.2 × 10^28 kg less than the reactants, how…

A: Energy released = (mp-mr)c2

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

A: Radioactivity

Q: 11. A 60 kg person accidentally ingests a small source of alpha particles (RBE=15). The activity of…

A: (a) Number of particles absorbed is equal to the number of particles decayed

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.