A spherical virus has a diameter of 50 nm. It is contained inside a long, narrow cell of length
0.0001 m. What uncertainty does this imply for the velocity of the virus along the length of the
cell? Assume the virus has a density equal to that of water.
Δx Δp ≥ 4π
Δp = mΔv
m = ρV
Heisenberg uncertainty principle
E = mc
Quantum mechanics limits the proton to two possible energies which correspond to two possible
orientations, aligned with or opposite the magnetic field.
μproton1.41 x 10 -26J/T
What is the proton energy corresponding to a spin flip for a proton in a 1.0 T magnetic
E = μB = 1.41 x 10