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  1. The potential energy of a weightless spring compressed by a distance D is proportional
  2. Laser beams are used to measure long distance because
  3. If, an electron in hydrogen atom jumps from an orbit of level n=3 to an orbit
  4. Two radioactive materials X₁ and X₂ have decay constants 5λ and λ respectively
  5. The displacement of a particle along the x-axis is given by x = a sin² ?t