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(D) The emission of characteristic $X$-rays starts only when the incident electrons are accelerated beyond a certain critical value. Once this thresho

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The intensities of characteristic lines relative to the white spectrum are increased,but there is no change in their wavelength.

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(D) The emission of characteristic $X$-rays starts only when the incident electrons are accelerated beyond a certain critical value. Once this threshold is exceeded,the intensity of the characteristic lines relative to the continuous (white) spectrum increases,but the wavelengths of these characteristic lines remain unchanged because they depend only on the atomic structure of the target material.

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?

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