5×104 m5\times 10^4\mathrm{~m}5×104 m
5×10−2 m5\times 10^{-2}\mathrm{~m}5×10−2 m
5×10−7 m5\times 10^{-7}\mathrm{~m}5×10−7 m
5×10−8 m5\times 10^{-8}\mathrm{~m}5×10−8 m
