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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
Observe the following graph for the de-Broglie wavelength of a hypothetical charged particle $(q = 1.6 × 10^{-19}\,C)$. Find the mass of the particle $(h = 6.0 × 10^{-34}\ J-s)$
  • ✓
    $45 × 10^{-49}\ kg$
  • B
    $45 × 10^{-45}\ kg$
  • C
    $4.5 × 10^{-45}\ kg$
  • D
    $4.5 × 10^{-45}\ gm$
✓

Answer

Correct option: A.
$45 × 10^{-49}\ kg$
a
$\frac{\mathrm{h}}{\sqrt{2 \mathrm{m} \times \mathrm{q}}}=\frac{1}{2}$

$\frac{6 \times 10^{-34}}{\sqrt{2 \times m \times 1.6 \times 10^{-19}}}=\frac{1}{2}$

$36 \times 10^{-68} \times 4=2 \times 1.6 \times 10^{-19} \times \mathrm{m}$

$\mathrm{m}=45 \times 10^{-49} \,\mathrm{kg}$ Ans.

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