Which of the following reactions is not allowed?a)andpi;++ n andrarr; K++andsum;0b)A++ n andrarr;andsum;0++ pc)panddeg;andrarr;andpi;+andpi;-d)None of the aboveCorrect answer is option 'B'. Can you explain this answer?

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EmSAT Achieve Exam > EmSAT Achieve Questions > Which of the following reactions is not allow...

Which of the following reactions is not allowed?

a)
π+ + n → K++ ∑⁰
b)
A⁺+ n → ∑^0 + + p
c)
p° → π⁺ π^-
d)
None of the above

Correct answer is option 'B'. Can you explain this answer?

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Verified Answer

Which of the following reactions is not allowed?a)π++ n → K++&...

A⁺+ n → ∑0 ⁺ + p
Here, "A" represents an arbitrary nucleus with a charge of +2 (A⁺+), "n" represents a neutron, "∑0" represents a neutral sigma particle, and "p" represents a proton.
In particle physics and nuclear reactions, there are certain conservation laws that must be obeyed.
Conservation of Charge: The total electric charge before a reaction should equal the total electric charge after the reaction.
In this reaction, the initial state (A⁺+ n) has a total electric charge of +2 (A⁺+) for the nucleus and a charge of 0 for the neutron. Therefore, the total initial charge is +2. However, in the final state (∑0 ⁺ + p), the neutral sigma particle (∑0) has no charge, and the proton (p) has a charge of +1.
This leads to a total electric charge in the final state of +1.
Since the total electric charge is not conserved in this reaction (initial state: +2, final state: +1), it is not allowed according to the conservation of charge.
So, the correct answer is indeed 2) A⁺+ n → ∑0 ⁺+ p because it violates the conservation of charge.
The total charge should remain the same before and after a reaction in accordance with the conservation laws of particle physics.

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