[填空题]
Protons are injected id6)cy2m19mjd(ltl vm nto the 1.0-km-radius Fermilab Tevatron with an en(m3zjk2.h(n z2 nao ghergy of 150 GeV. If they are accelerated by 2.5 MV each revolution, how far do they azzn3.kmh( 2 ojnh2(g travel and approximately how long does it take for them to reach 1.0 TeV? d$\approx $ $ \times 10^9\ \text{m}$
