Is the electron leaving the "machine" in the double-slit experiment the same one hitting the screen?

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(OP) As famously known, Feynman states that the single electron used in the double-slit experiment takes every possible path simultaneously before coming to the final goal which is the phosphorescent screen. My question is: How sure are we that this electron really is the one that left the "machine"? Please explain shortly if this is proved. Sorry if the question (or the english) sounds stupid, I'm a newbie to both the quantum mechanics as well as english. :)
 
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Hello Jens and welcome to PF!

This thread is meant to introduce yourself to the community. Please post your question in
https://www.physicsforums.com/forums/quantum-physics.62/
or even better search our forum and Insights for "double-slit".
I'm sure you will find plenty of threads that deal with this subject and possibly find an answer.
 
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Hello everyone, I'm Cosmo. I'm an 18 years old student majoring in physics. I found this forum cause I was searching on Google if it's common for physics student to feel like they're in the wrong major in the first semester cause it feels like too much for me to learn the materials even the ones that are considered as "basic math" or "basic physics", I've initial fascination with the universe's mysteries and it disconnect with the reality of intense, foundational mathematics courses required...
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