For three experiments, Fig. 38-23 gives the transmission coefficient T for electron tunnelling...

For three experiments, Fig. 38-23 gives the transmission coefficient T for electron tunnelling through a potential barrier, plotted versus barrier thickness L.  The de Broglie wavelengths of the electrons are identical in the three experiments. The only difference in the physical setups is the barrier heights U6. Rank the three experiments according to U_b, greatest first.

Fig. 38-23