According to the Bohr model, an absorption occurs when an electron moves from a lower to a higher energy level and emission occurs when an electron moves from a higher to a lower energy level.
Following the Bohr model, electrons are found in certain specific energy levels. When an electron moves from one energy level to another, energy may be absorbed or emitted.
Movement from a higher to a lower energy level means that energy is emitted while movement from a lower to a higher energy level means that energy is absorbed.
Based on this, we can now sort the transitions as follows;
E2 to E1 ----- emission
E1 to E3 ------- absorption
E6 to E3 ------- emission
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