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Please help

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My understanding

So, i understand the concept of the wave particle duality. Now if we try to measure which slit the photon goes through photon behaves likes a particle and if we do not measure it the double slit experiment shows that light behaves like a wave. This is quite mind boggling to me, and most others i would imagine hahaha!!

Now my question is this, if we are pointing the photon gun at a particular slit then should the photon not travel through this slit and so there is no need to measure which slit it went through?

Are things ultimately in all states at the one time before we measure them to find out which state they are in?

Also what is even more confusing to me is that this behavior is not present in the non subatomic world. I,e. schrodinger's cat must be alive or dead when it is in the box, as it simply cannot be alive and dead at the same time in the non sub atomic world

Any chat or insight would be very helpful as im completely out of my depth but generally very interested in such things!!

thanks