Q178 / 200 · Manipal (MET) 2012 · Physics

de-Broglie wavelength of a body of mass 1 kg moving with velocity of $2000 \mathrm{~m} / \mathrm{s}$ is

  • Correct answer
    A
    $3.32 \times 10^{-27} Å$
  • B
    $1.5 \times 10^7 Å$
  • C
    $0.55 \times 10^{-22} Å$
  • D
    None of these

Solution

$\begin{aligned} \lambda=\frac{h}{m v} & =\frac{6.6 \times 10^{-34}}{1 \times 2000} \\ & =3.3 \times 10^{-37} \mathrm{~m}=3.3 \times 10^{-27} Å\end{aligned}$

Hence, the correct answer is option: 'A'.

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