The need to use Kα transition (2p→1s) in Copper to generate X-rays? And why not use, for example, the 4s→3p transition?

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Chapter 12, Problem 89E

Interpretation Introduction

To determine: The need to use Kα transition (2p→1s) in Copper to generate X-rays? And why not use, for example, the 4s→3p transition?

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