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12. atoms — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics12. atoms1 Mark
MCQ
Solid targets of different elements are bombarded by highly energetic electron beams. The frequency $(f)$ of the characteristic $X-$ rays emitted from different targets varies with atomic number $Z$ as
  • A
    $f \propto \sqrt Z $
  • ✓
    $f \propto {Z^2}$
  • C
    $f \propto Z$
  • D
    $f \propto {Z^{3/2}}$
✓

Answer

Correct option: B.
$f \propto {Z^2}$
b
$\lambda \propto \frac{1}{{{Z^2}}} \Rightarrow \frac{c}{\nu } \propto \frac{1}{{{Z^2}}}$

$\Rightarrow \nu \propto {Z^2}$

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