\( \Rightarrow \frac{{{\lambda _2}}}{{{\lambda _1}}} = {\left( {\frac{{{Z_1} - 1}}{{{Z_2} - 1}}} \right)^2}\)
\( \Rightarrow \frac{{{\lambda _2}}}{\lambda } = {\left( {\frac{{43 - 1}}{{29 - 1}}} \right)^2} = {\left( {\frac{{42}}{{28}}} \right)^2}\)
==> \({\lambda _2} = \frac{9}{4}\lambda \).