Question

An electron beam is accelerated by a potential difference $V$ to hit a metallic target to produce $X-$rays. It produces continuous as well as characteristic $X$-rays. If $\lambda_{\text{min}}$ is the smallest possible wavelength of $X$-ray in the spectrum, the variation of $\log \, \lambda_{\text{min}}$ with log $V$ is correctly represented in :

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Answer 2

In X-ray tube
$\lambda_{\text{min}} = \frac{hc}{eV}$
In $\lambda_{\text{min}} = In \left(\frac{hc}{e}\right) -In V$
Slope is negative
Intercept on y-axis is positive