xcited state of a nucleus decays in 100 femtoseconds. If the energy of a number of...
When a substance decays by alpha radiation, the mass number of the nucleus ________ and the atomic number ________.
A radium nucleus(Ra) at rest decays into a radon (Rn) nucleus and an alpha (a) particle. mRa =56.5ma mRn =55.5ma a. Find the ratio of the speed Va / VRn after the decay b. Find the ratio of the magnitude of the momenta Pa / PRn after the decay c. Find the ratio of kinetic energy KEa / KERn after the decay. show work algebraically
The nucleus 'o decays by electron capture. The nuclear reaction is written 10+ e- → N + v chemPad Help X. X" - FC Greek (a) Write the process going on for a single particle within the nucleus. (b) Disregarding the daughter's recoil, determine the energy of the neutrino. (Use the table of atomic masses as necessary.) MeV
(a) Rank the following decays in order of the change in atomic number Z that occurs in the decaying nucleus, from most positive (greatest increase in Z) to most negative (greatest decrease in Z). If any two decays cause the same change in Z, state this. Explain how you made your ranking. (i) Alpha decay (emission of a 4He nucleus of charge +2e) (ii) Beta-minus decay (emission of an electron of charge –e and an antineutrino) (iii) Beta-plus decay (emission...
Some early theories on nuclear structure proposed that the nucleus contained a number of electrons. Suppose that this is true. Treat an electron in the nucleus as a 1-dimensional Particle in a Box that has a nuclear size. In other words, the width of the box is 3 x 10-14 m. What is the Energy of the Ground State (give your answer in MeV)? Tries 0/3 What is the Energy of the First Excited State (give your answer in MeV)?...
The nucleus 40K decays by emitting a Beta^- and a massless anti-neutrino, with a half life of 1.25*10^9 years. (a) Write the formula showing the products of this decay, identifying the daughter nucleus. (b) How much energy in MeV is released in the decay? (c) What fraction of the 40K that was present when the earth formed 3.5 billion years ago still remains?
Outside the nucleus, the neutron itself is radioactive and decays into a proton, an electron, and an antineutrino. The half-life of a neutron (mass = 1.675 × 10-27 kg) outside the nucleus is 10.4 min. On average, over what distance x would a beam of 3.39-eV neutrons travel before the number of neutrons decreased to 75.0% of its initial value? Ignore relativistic effects.
Activity 27-7. Nuclear decays II [Accompanies Section 27-6] (a) Rank the following decays in order of the change in atomic number Z that occurs in the decaying nucleus, from most positive (greatest increase in Z) to most negative (greatest decrease in Z). If any two decays cause the same change in Z, state this. Explain how you made your ranking. (i) Alpha decay (emission of a He nucleus of charge +2e) (ii) Beta-minus decay (emission of an electron of charge...
Book question I could not answer Nuclear Engineering Or Nuclear Physics. 1. Consider a stationary nucleus of mass m in an excited state with energy E* above the ground state. When this nucleus decays to the ground state by gamma decay, the emitted photon has an energy Ey. (a) By considering the conservation of both energy and momentum of the decay reaction explain why Ey < E*. (b) Show that the two energies are related by (c) Use an explicit...
Tritium (3H) decays by negative beta decay with a half-life of 12.26y. To what nucleus does 3H decay to – show the equation for the decay mode; Calculate the number of Curies of activity in 1g of 3H.