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 ${\lambda }_{min}$ is the smallest possible wavelength of $X-$ray in the spectrum, the variation of $\log \left({\lambda }_{min}\right)$ with $\log \left(V\right)$ is correctly represented in :

• A

  

• Correct answer
  B

  

• C

  

• D

  

Hence, the correct answer is option: 'B'.