Question
Which change would directly cause the minimum
wavelength in X-ray emission to decrease?Solution
The minimum wavelength in X-ray emission corresponds to the maximum energy of emitted X-rays, which depends directly on the kinetic energy of the incident electrons . This kinetic energy is determined by the accelerating potential (V) applied across the X-ray tube. The relation is: 
So, increasing the accelerating potential increases the maximum energy, thereby decreasing the minimum wavelength of emitted X-rays.
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