\( \mathrm{X} \)-rays are produced by accelerating electrons across...

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\( \mathrm{X} \)-rays are produced by accelerating electrons across a given potential difference to strike a meta target of high atomic number. If the electrons have same speed when they strike the target, the \( \mathrm{X} \)-ray spectrum
\( \mathrm{P} \) will exhibit.
(A) a minimum wavelength
W
(B) a continuous spectrum
(C) some discrete comparatively prominent wavelength
(D) uniform density over the whole spectrum
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