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Isaac Physics Quantum Mechanics

I was just wondering if anyone has done or can do the 3 questions attached below, as I've been struggling on them for quite a while. If you have and are willing to help, please reply to this comment so that I can explain my approaches to them so far. Many thanks.

https://isaacphysics.org/questions/qmp_ch4_q30_new?board=qmp_ch4_29_38_r1&stage=university

https://isaacphysics.org/questions/qmp_ch5_q12_r1?board=qmp_5_9_17_r1&stage=university

https://isaacphysics.org/questions/qmp_ch5_q13?board=qmp_5_9_17_r1&stage=university

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