To determine the masses of the isotopes of an element which of the following techniques is useful

Options :
  1. the spectroscopic examination of the light emitted by vaporized elements subjected to electric discharge
  2. the photographing of the diffraction patterns which arise when X-rays are passed through crystals
  3. the bombardment of metal foil with alpha particles
  4. the acceleration of charged atoms by an electric field and their subsequent deflection by a variable magnetic field
Answer and Explanation :-

Answer: Option 4

Explanation:

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