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Electron capture is a variant on beta-radiation. The lightest nucleus to decay by electron capture is "Be -- beryllium-7. The daughter nucleus is Li -- lithium-7. The electron is transformed into a massless particle (a neutrino): e +"Be+ → 7Li + v The initial electron is bound in the atom, so the beryllium mass includes the electron. In fact, 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 uc? 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 "Be -- beryllium-7. The daughter nucleus is Li -- lithium-7. The electron is transformed into a massless particle (a neutrino): e +"Be+ → 7Li + v The initial electron is bound in the atom, so the beryllium mass includes the electron. In fact, 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 uc? 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
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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Electron capture is a variant on beta-radiation. The lightest nucleus to decay by electron capture is "Be -- beryllium-7. The daughter nucleus is Li -- lithium-7. The electron is transformed into a massless particle (a neutrino): e +"Be+ → 7Li + v The initial electron is bound in the atom, so the beryllium mass includes the electron. In fact, 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 uc? 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)
Transcribed Image Text:Electron capture is a variant on beta-radiation. The lightest nucleus to decay by electron capture is "Be -- beryllium-7. The daughter nucleus is Li -- lithium-7. The electron is transformed into a massless particle (a neutrino): e +"Be+ → 7Li + v The initial electron is bound in the atom, so the beryllium mass includes the electron. In fact, 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 uc? 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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