To determine the masses of the isotopes of an element which of the following techniques is useful [NCERT 1978; MNR 1979]

The spectroscopic examination of the light emitted by vaporised elements subjected to electric discharge

The acceleration of charged atoms by an electric field and their subsequent deflection by a variable magnetic field

The photographing of the diffraction patterns which arise when X-rays are passed through crystals

The bombardment of metal foil with alpha particles

To determine the masses of the isotopes of an element which of the fol

1.	To determine the masses of the isotopes of an element which of the following techniques is useful [NCERT 1978; MNR 1979]
A.	The acceleration of charged atoms by an electric field and their subsequent deflection by a variable magnetic field
B.	The spectroscopic examination of the light emitted by vaporised elements subjected to electric discharge
C.	The photographing of the diffraction patterns which arise when X-rays are passed through crystals
D.	The bombardment of metal foil with alpha particles
Answer» B. The spectroscopic examination of the light emitted by vaporised elements subjected to electric discharge

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