Question

The change in velocity when hydrogen electron jumps from K shell to L shell is:

• A. one-half of its original velocity
• B. twice to its original velocity
• C. one-quarter of its original velocity
• D. equal to its original velocity

Answer 1

Answer: (A)

one-half of its original velocity

$V\propto \frac{Z}{n}$
For $K,n=1$
For $L,n=2$
$\therefore$ Velocity in L shell will be half of velocity in K shell.