The position of both an electron and a helium atom is known within $1.0 \, nm$ and the momentum of the electron is known within $50 \times 10^{-26} \, kg \, m \, s^{-1}$. The minimum uncertainty in the measurement of the momentum of the helium atom is

  • A
    $50 \, kg \, m \, s^{-1}$
  • B
    $60 \, kg \, m \, s^{-1}$
  • C
    $80 \times 10^{-26} \, kg \, m \, s^{-1}$
  • D
    $50 \times 10^{-26} \, kg \, m \, s^{-1}$

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Assertion $(A)$: The probability of finding an electron in a small volume around a point $(x, y, z)$ at a distance $r$ from the nucleus is proportional to $\psi^2$.
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