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  4. The wavelength of the most energetic X- ray emitted when a metal target is bombarded by 100 keV electrons, is approximately

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Q. The wavelength of the most energetic $ X- $ ray emitted when a metal target is bombarded by $100\,keV$ electrons, is approximately

Punjab PMETPunjab PMET 2011

Solution:

Wavelength $\lambda =\frac{12375}{E} \mathring{A}$
$=\frac{12375}{100 \times 10^{3}} \mathring{A}$
$=0.12375\, \mathring{A}$
$=0.124\, \mathring{A}$