What is the value of R in meters for a proton with momentum pc = 7.9x10^4 MeV, moving in a magnetic field of 41x10^6 T, according to the informatio...

What is the value of R in meters for a proton with momentum pc = 7.9x10^4 MeV, moving in a magnetic field of 41x10^6 T, according to the information given in problem E32-19?
a) 6.4x10^6
b) 1.52x10^2
c) 4.84x10^3
a) The proton is ultra-relativistic.
b) The proton is not ultra-relativistic.
c) The question does not provide enough information to determine if the proton is ultra-relativistic.
a) a and i are correct.
b) b and ii are correct.
c) c and iii are correct.
d) a and iii are correct.
e) b and iii are correct.