Q$1$hT$\mathrm{.}4$ Two electrons are placed into separate $($very tiny$)$ one$-$dimensional boxes A and B$.$ When the electrons are excited to higher energy levels and then decay to lower levels, they emit photons. The longest$-$wavelength spectral line from the electron in box A is observed to have the same wavelength as the third$-$longest spectral line from the electron in box B$.$ The ratio of the box lengths La$/$L$,$ is equal to