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The electron won't jump the energy level if it's not given the exact amount of energy needed. So it would need exactly 2 joules to go from n1 to n2 and if it's given 2.5 joules it just won't change energy levels.
It needs a discrete amount. That's why only specific wavelengths are absorbed/emitted, because those exact frequencies give energies that move the electron from one level to the next. Each atom has a unique absorption and emission spectrum.
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