Question

$K_{\alpha }$ and $K_{\beta }x-$ rays are emitted when there is a transition of electron between the levels

• A. n = 2 to n = 1 and n = 3 to n = 1 respectively
• B. n = 2 to n = 1 and n = 3 to n = 2 respectively
• C. n = 3 to n = 2 and n = 4 to n = 2 respectively
• D. n = 3 to n = 2 and n = 4 to n = 3 respectively

Answer 1

Answer: (A)

When the colliding electron remove an electron from innermost $K$ - shell (corresponding to $n=1$ ) of atom and electron from some higher shell jumps to $K$ - shell to fill up this vacancy, characteristic $X$ - ray of $K$ - series are obtained

$\therefore K_{\alpha }$ and $K_{\beta }X$-rays are emitted when there is transition of electron between the levels $n=2$ to $n=1$ and $n=3$ to $n=1$ respectively.