[填空题]
The voltage across the dees of a cyclotron is 55 kV. How manymxg)o 0ek prk vh. .fytg3a,:3iub5)y revolutions do pr(b 8gs7d*m nnfzba0f: n3orn8otons make to reach a kinetic energy of 25 M8ffbn8oa7m(nnd3 zgn*r :sb 0eV? $\approx $ $\ \text{revolutions}$
