Energies of orbitals, de Broglie and uncertainty principle

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1. 1 2017 Structure of Atom #
   Which one is the wrong statement?
   A de-Broglie's wavelength is given by $\lambda = \frac{h}{mv}$, where m = mass of the particle, v = group velocity of the particle B The uncertainty principle is $\Delta E\times\Delta t \ge \frac{h}{4\pi}$ C Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement D The energy of 2s orbital is less than the energy of 2p orbital in case of Hydrogen like atoms
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