State the de Broglie principle.

  • A
    Matter exhibits dual behavior: particle-like and wave-like.
  • B
    Energy is emitted in discrete packets called quanta.
  • C
    It is impossible to determine the exact position and momentum of an electron simultaneously.
  • D
    Electrons occupy orbitals in increasing order of energy.

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The mass of an electron is $9.1 \times 10^{-31} \ kg$. If its $K.E.$ is $3.0 \times 10^{-25} \ J$,calculate its wavelength.

What will be the de Broglie wavelength associated with a charged proton in $\mathring{A}$? ($V =$ potential difference)

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The basis of the quantum mechanical model of an atom is:

If the radius of the first orbit of hydrogen atom is $a_0$, then de Broglie's wavelength of electron in $3^{rd}$ orbit is (in $\pi a_0$)

If $a_0$ is the Bohr radius,then the de-Broglie wavelength of an electron revolving in the second excited state of the $H$ atom will be:

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