Electron capture is a variant on beta-radiation. The lightest nucleus to decay by electron capture is 7Be -- beryllium-7. The daughter nucleus is 7Li -- lithium-7. The electron is transformed into a massless particle (a neutrino): e +"Be* → "Li + v The initial electron is bound in the atom, so the beryllium mass includes the electron. Infact, since the electron starts bound in the atom, a more-accurate statement of the nuclear reaction is probably: "Be → "Li + v The masses are beryllium: 7.016929 u, and lithium: 7.016003 u, and refer to the neutral atom as a whole. (Use uc and uc² as your momentum and energy units -- but carry them along in your calculation.) The initial beryllium atom is stationary. Calculate the speed of the final lithium nucleus in km/s. (You will make life much easier for yourself if you recognize that practically all the energy released goes into the lighter particle. c = 300,000 km/s)

Electron capture is a variant on beta-radiation. The lightest nucleus to decay by electron capture is 7Be -- beryllium-7. The daughter nucleus is 7Li -- lithium-7. The electron is transformed into a massless particle (a neutrino): e +"Be* → "Li + v The initial electron is bound in the atom, so the beryllium mass includes the electron. Infact, since the electron starts bound in the atom, a more-accurate statement of the nuclear reaction is probably: "Be → "Li + v The masses are beryllium: 7.016929 u, and lithium: 7.016003 u, and refer to the neutral atom as a whole. (Use uc and uc² as your momentum and energy units -- but carry them along in your calculation.) The initial beryllium atom is stationary. Calculate the speed of the final lithium nucleus in km/s. (You will make life much easier for yourself if you recognize that practically all the energy released goes into the lighter particle. c = 300,000 km/s)

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

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.

Question

Electron capture is a variant on beta-radiation. The lightest nucleus to decay by electron capture is
7Be -- beryllium-7. The daughter nucleus is 7Li -- lithium-7. The electron is transformed into a
massless particle (a neutrino):
e +"Be* → "Li + v
The initial electron is bound in the atom, so the beryllium mass includes the electron. Infact, since
the electron starts bound in the atom, a more-accurate statement of the nuclear reaction is probably:
"Be → "Li + v
The masses are beryllium: 7.016929 u, and lithium: 7.016003 u, and refer to the neutral atom as a
whole. (Use uc and uc² as your momentum and energy units -- but carry them along in your
calculation.)
The initial beryllium atom is stationary. Calculate the speed of the final lithium nucleus in km/s. (You
will make life much easier for yourself if you recognize that practically all the energy released goes
into the lighter particle. c = 300,000 km/s)

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