Order these units from smallest to largest: cm, μm, km, mm, m, nm, dm, pm. Then give each measurement in terms of meters.
a) pm, nm, μm, mm, cm, dm, m, km
b) 1 pm, 1e-9 m; 1 nm, 1e-6 m; 1 μm, 1e-3 m; 1 mm, 1e-3 m; 1 cm, 1e-2 m; 1 dm, 1e-1 m; 1 m, 1 m; 1 km, 1e3 m