A positron ( the antiparticle of electron ) has a mass of 9.11x10^-31kg and a charge +e=+1.6x10^-19 C. Suppose a positron moves in the vicinity of an alpha particle, which has a charge +2e=3.20x 10^-19 C. The alpha particle is more than 7000 times as massive as the positron, so we assume that it is at rest in some inertial frame inference. When the positron is 1.00x 10^-10m from the alpha particle, it is moving directly away from the alpha particle at a speed of 3.00x 10^6 m/s.
(a). What is the position's speed he the particles are 2.00 x 10^-10m apart?
(b)What is the position's speed when it is very far away from the alpha particle?
(c) How would the situation change if the moving particle were an electron (same mass as the positron but opposite charge)?
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Ответ:
The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.
Explanation;According to the law of conservation of mass, in every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side.