• # question_answer Which of the following electron transition in a hydrogen atom will require the largest amount of energy                 [UPSEAT 1999, 2000, 01] A)                 From $n=1$ to $n=2$                B)                 From $n=2$ to $n=3$ C)                 From $n=\infty$ to $n=1$      D)                 From $n=3$ to $n=5$

$E\propto \left[ \frac{1}{n_{2}^{2}}-\frac{1}{n_{1}^{2}} \right]$