When the accelerating voltage applied to the electrons is increased beyond a critical value in an $X$-ray tube,what happens to the $X$-ray spectrum?
- AOnly the intensity of the various wavelengths is increased.
- BOnly the wavelength of characteristic radiation is affected.
- CThe spectrum of white radiation is unaffected.
- DThe intensities of characteristic lines relative to the white spectrum are increased,but there is no change in their wavelength.
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