$A$ cricket ball of $0.5 \ kg$ is moving with a velocity of $100 \ m/s$. The wavelength associated with its motion is

  • A
    $1/100 \ cm$
  • B
    $6.6 \times 10^{-34} \ m$
  • C
    $1.32 \times 10^{-35} \ m$
  • D
    $6.6 \times 10^{-28} \ m$

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When an electron in a hydrogen atom jumps from the third excited state to the ground state,the de-Broglie wavelength associated with the electron becomes

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