Given below are two statements about X -ray spectra of elements :
Statement (I): A plot of $\sqrt{v}$ ( $v=$ frequency of X-rays emitted) vs atomic mass is a straight line.
Statement (II): A plot of $v(v=$ frequency of X -rays emitted) vs atomic number is a straight line.
In the light of the above statements, choose the correct answer from the options given below:
