The viscous force $F$ acting on a sphere of radius $r$ moving with velocity $v$ through a fluid of viscosity $\eta$ is given by $F = 6\pi \eta rv + kr^2v^2$. The dimensions of $k$ are:

One million electron $volt\;\left( {1\;MeV} \right)$ is equal to

Wavelength of ray of light is 0.00006 m. It is equal to