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COMEDK20269 May 2026Evening ShiftChemistryStructure of AtomActual

Which of the following statement is correct ?

Options

  1. AAzimuthal Quantum number explains about spatial orientation of orbital
  2. BHeisenberg uncertainty principle can be applied to all the objects and for macroscopic objects the uncertainty
  3. CPhoton has momentum as well as wavelength, but electrons do not have momentum and wavelength
  4. DIn photoelectric effect if frequency > _o , then photoelectrons are ejected with certain kinetic energy

Correct answer

D. In photoelectric effect if frequency > _o , then photoelectrons are ejected with certain kinetic energy

Step-by-step solution

The azimuthal quantum number ( l ) describes the shape of the orbital, whereas the magnetic quantum number ( m_l ) describes the spatial orientation of the orbital. Thus, the first statement is incorrect. The Heisenberg uncertainty principle applies to all objects, but for macroscopic objects, the mass is large, making the uncertainty in position and velocity extremely small and negligible. Thus, the second statement is incorrect. According to the de Broglie hypothesis, all material particles in motion, including e

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