In a Certain Particle Accelerator,a Current of 300 $\mu$ A Is Carried by a 4

Multiple Choice

In a certain particle accelerator,a current of 300 $\mu$ A is carried by a 4.00-MeV proton beam that has a radius of 1.30 mm.The mass of a proton is 1.67 $\times$ 10^-27 kg.If the beam hits a target,how many protons hit the target in 3 s?

A) 1.55 $\times$ 10¹⁵
B) 8.64 $\times$ 10¹⁵
C) 3.42 $\times$ 10¹⁵
D) 4.29 $\times$ 10¹⁵
E) None of these is correct.