n this solution: https://www.bartleby.com/questions-and-answers/47.-a-write-the-complete-b-decay-equation-for-90sr-a-major-waste-product-of-nuclear-reactors.-b-find/e0ee8e97-f2b9-4072-856f-eca30998c143 Why did we not include the mass of the beta particle (same as the mass of an electron).  The mass of the antineutrino v^bar is negligible so it's ok to leave out. If we include the mass of the beta particle should the solution be .349 meV?

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Why did we not include the mass of the beta particle (same as the mass of an electron).  The mass of the antineutrino v^bar is negligible so it's ok to leave out.

If we include the mass of the beta particle should the solution be .349 meV?

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 particle are emitted with very high velocity (up to ).
So, according to Einstein's theory of relatively, the mass of a  particle is much higher compared to is its rest mass  The velocity of electrons obtained by other means is very small compared to c (Velocity of light). So its mass remain nearly  But  particle and electron both are similar particles.

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