question_answer

Directions: In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:

Let\[{{\lambda }_{\alpha }},{{\lambda }_{B}}\]and\[\lambda _{\alpha }^{'}\]denote the wavelength of the X-rays of the\[{{K}_{\alpha }},{{K}_{B}}\]and\[{{L}_{\alpha }}\]lines in the characteristics, X-rays for a metal: (1) \[\lambda _{\alpha }^{'}>\lambda _{\beta }^{'}>\lambda _{\alpha }^{{}}\]     (2) \[\lambda _{\alpha }^{'}>\lambda _{\alpha }^{'}>\lambda _{\beta }^{{}}\] (3) \[\frac{1}{{{\lambda }_{\beta }}}=\frac{1}{{{\lambda }_{\alpha }}}+\frac{1}{\lambda _{\alpha }^{'}}\]                (4) \[\frac{1}{{{\lambda }_{\alpha }}}+\frac{1}{{{\lambda }_{\beta }}}=\frac{1}{\lambda _{\alpha }^{'}}\]

A)  1 and 2 are correct

B)  2 and 3 are correct

C)  1 and 4 and correct

D)  1, 2 and 4 are correct