$1|$ A filter is to be selected for an X$-$ray tube to remove the Ky radiation. The filter should be selected from material A$.$ B$.$ C$\text{'}$ or D$).$ The mass absorption coefficient of material A$.$ B$.$ Cand $1)$ for Ke radiation is $240\mathrm{.}8$ cm$/$g$,291\mathrm{.}8$ cm$/$g$,310\mathrm{.}8$ cm$/$g$,$ and $340\mathrm{.}8$ cm$*/$grespectively$.$ Similarly, the mass absorption coefficient of material A$.$ B$.$ C and D for Kuradiation is $49$ cm$/$g$.61$ cm$/$g$.59$ cm$/$g and $40$ cm$/$g respectively. Select a propermaterial for filter giving suitable reason and calculate the thickness of the filter forachieving Ku$/$Kg ratio of $500$ from initial $10.$ Also calculate the transmission factor of thefilter for Ku$.$ The density of all the materials is same $(8\mathrm{.}9$ g$/$cc$).$