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  1. If, an electron in hydrogen atom jumps from an orbit of level n=3 to an orbit
  2. Photons of 5.5 eV energy fall on the surface of the metal emitting photoelectrons
  3. A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle
  4. A proton and helium nucleus are shot into a magnetic field at right angles to the field
  5. Two identical thin plano-convex glass lenses (refractive index 1.5) each having