How many wavelengths of $Kr^{86}$ are there in one metre?

If ${u_1}$ and ${u_2}$ are the units selected in two systems of measurement and ${n_1}$ and ${n_2}$ are their respective numerical values,then:

The biggest unit of length among the following is:

$Torr$ is the unit of

Newton-second is the unit of

One pico Farad is equal to