The wavelength of K-alpha characteristic x-rays only depends upon:
The atomic energy levels
Current in the Coolidge tube setup
Accelerating potential in the Coolidge tube
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Atomic energy levels decide the amount of energy released in an electronic transition, and the wavelength of a photon is dependent on their energy.
Cutoff wavelength of X-rays coming from a Coolidge tube depends on the
In a Coolidge tube the intensity of X-rays produced depends on