How an atom can be excited ?

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An atom can be excited to state higher than the ground state by one of the following methods
(i) Due to collision with another atom during which part of kinetic energy is absorbed by the atom and can come back to the ground state in time ≈ 10-⁸ sec by the emission of a Photon.
(ii) By making use of an electric field which may accelerate atomic ions till they have enough energies to excite atoms they come across during collisions.

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