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How do you know if it's a strong or weak interaction?

So when you're given a decay equation, how do you know if it's strong or weak? I know that if strangeness isn't conserved (and there's neutral particle(s) involved) it has to be a weak interaction, but otherwise...??
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olivier_
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weakorstrong.png

This is the past paper question that got me confused.
For part (b) the answer is strong nuclear, and for part (d) it is weak nuclear.

Part (d) makes sense in my head, but I was confused about part (b), and when I looked it up on Google, this website (https://www.cyberphysics.co.uk/Q&A/KS5/particle/A11.html) said that part (b) is a strong interaction because weak interactions must involve leptons. But that contradicts with the answer to part (d), as X must be a baryon.

Someone please help me out...!
Original post by olivier_
weakorstrong.png

This is the past paper question that got me confused.
For part (b) the answer is strong nuclear, and for part (d) it is weak nuclear.

Part (d) makes sense in my head, but I was confused about part (b), and when I looked it up on Google, this website (https://www.cyberphysics.co.uk/Q&A/KS5/particle/A11.html) said that part (b) is a strong interaction because weak interactions must involve leptons. But that contradicts with the answer to part (d), as X must be a baryon.

Someone please help me out...!


Weak nuclear at a level are seen to be decays. The first one, strangeness is conserved as implied that X is strange, no leptons as well but most importantly the particles are not decaying, they are interacting with each other. In the second example, it says decay, so therefore will be weak
Original post by olivier_
weakorstrong.png

This is the past paper question that got me confused.
For part (b) the answer is strong nuclear, and for part (d) it is weak nuclear.

Part (d) makes sense in my head, but I was confused about part (b), and when I looked it up on Google, this website (https://www.cyberphysics.co.uk/Q&A/KS5/particle/A11.html) said that part (b) is a strong interaction because weak interactions must involve leptons. But that contradicts with the answer to part (d), as X must be a baryon.

Someone please help me out...!

i just remember that the strange particles (like kaons) are produced through the strong force and they decay through the weak force?
(edited 1 year ago)

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