In a Certain Particle Accelerator, a Current of 300 μA

question 28

Multiple Choice

In a certain particle accelerator, a current of 300 μA 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 × 10^-27 kg. What is the number of protons per unit volume in this beam?

• A) 3.64 × 10¹³ protons/m³
• B) 2.76 × 10¹³ protons/m³
• C) 1.28 × 10¹³ protons/m³
• D) 5.98 × 10¹³ protons/m³
• E) 4.17 × 10¹³ protons/m³

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