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(A) When an electron transitions from a higher energy level $(n_2)$ to a lower energy level $(n_1)$,the difference in energy is released in the form o

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Energy is emitted

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(A) When an electron transitions from a higher energy level $(n_2)$ to a lower energy level $(n_1)$,the difference in energy is released in the form of a photon.The energy of the emitted photon is given by the equation $E = \Delta E = E_2 - E_1 = hc / \lambda$.Conversely,when an electron moves from a lower energy level to a higher energy level,it must absorb energy equal to the difference between the two levels.The state with the lowest energy for an electron is called the ground state.

When an electron drops from a higher energy level to a lower energy level,then

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