Question

For which of the following voltages will the wavelengh of emitted $X$-rays will be minimum?

• A. $10\,kV$
• B. $20\,kV$
• C. $30\,kV$
• D. $40\,kV$

Answer 1

Answer: (D)

$40\,kV$

Answer 2

$eV= \frac{hc}{\lambda_{\text{min}}}$ i.e., $\lambda_{\text{min}} \propto \frac{1}{V}$ means higher is the value of $V$, the smaller is the value of $\lambda_{\text{min}}$