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  1. In a mass spectrometer used for measuring the masses of ions, the ions
  2. Electrons in a certain energy level n=n₁, can emit 3 spectral lines. When they
  3. The time period of bar magnet is doubled when magnetic field is reduced
  4. The electromagnetic waves detected using a thermopile and used in physical therapy
  5. A body is under stress F and has Young’s modulus Y, then the energy