[填空题]
As a rule of thumb, anyhsn3 s*jf1o, athing traveli p) t.nam6kb4h4 xmh/mt z02rgng faster than about 0.1c is called relativistic - i.e., for which the corr0 4ta nm2xh)ztm.h4r/6mbk pgection using special relativity is a significant effect. Determine the speed of an electron in a hydrogen atom ($v \approx 2.2 \times 10^6 \, \text{m/s}$) and state if it is relativistic. (Treat the electron as though it were in a circular orbit around the proton.)
