LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
24 views
in Physics by (30.0k points)
closed by
The strangeness conservation law does not hold in
1. π0 = γ + γ
2. \(\bar \mu + p \to n + {\mu ^ + } + \gamma \)
3. A0 → p + π
4. A0 + p → ε+ + n

1 Answer

0 votes
by (54.3k points)
selected by
 
Best answer
Correct Answer - Option 3 : A0 → p + π

Concept:

  • During the research, scientist found that there were a large number of particle which behaved in a very strange manner.

  • They were produced by strong electromagnetic interaction.

  • They decay via weak interactions.

  • The quantum number associated with that particle is named as strangeness numbers.

Conservation:

  • Strangeness number are conserved in EM/strong interaction.

  • They are not conserved in weak interactions.

Some strangeness numbers and their values 

Particle Name Symbol Anti-particle Baryon Electron Lapton Muon Lapton Tau Lapton Strangeness number
      B Le Lμ LT S
Photon γ  self 0 0 0 0 0
Pion

π+ 

π-   0 0 0 0
Pion π0  self 0 0 0 0 0
Muon μ μ 0 0

+1 , -1 

0 0
Photon p p̅  +1, -1 0 0 0 0
Nutron n n̅  +1, -1 0 0 0 0
Omega Ω-  Ω+ +1, -1 0 0 0 -3, +3
Labda A0 0 +1, -1 0 0 0 -1, +1
electron e- e+ 0 +1, -1 0 0 0


Calculation:

We can check conservation by balancing the quantum number on both sides of the reaction by using the above data.

π0 = γ + γ

 0     0    0

\(̅ \mu + p \to n + {\mu ^ + } + \gamma \)

 0    0     0     0       0

A0 → p + π

-1     0     0

A0 + p → ε+ + n

-1     0     -1     0

 0     0      0      0

From the above discussion, we can see that, strangeness conservation law does not hold in A0 → p + π.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...