In scientific research, scientists should clearly publish the procedures used in their experiments, along with their observations and data. Why is it important for someone else to know the procedure?
A. Knowing the procedure allows for the repetition of the experiment.
B. Knowing the procedure allows for the replication of the experiment.
C. Knowing the procedure helps others understand the reasons for the experiment.
D. Knowing the procedure can explain how the data were interpreted by the scientist.

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?