Question

What is the maximum number of emission lines when the excited electron of a hydrogen atom in $n=6$ drops to ground state?

• A. $6$
• B. $15$
• C. $30$
• D. $10$

Answer 1

Answer: (B)

Maximum number of emission lines
$=\frac{n\left(n-1\right)}{2}$
$=\frac{6\left(6-1\right)}{2}$
$=\frac{30}{2}$
$=15$ lines