In a Particle Accelerator, Protons Are Fired at a Stationary

question 19

Multiple Choice

In a particle accelerator, protons are fired at a stationary target and collide elastically with the nuclei of the atoms in the target. In one such experiment, a beam of protons is fired with a speed of 2.10 × 10⁷ m/s. The protons that undergo a collision rebound with a speed of 1.68 × 10⁷ m/s. What is the mass of the nuclei that the protons are colliding against?

• A) 6.00 proton masses
• B) 7.00 proton masses
• C) 8.00 proton masses
• D) 9.00 proton masses
• E) 10.0 proton masses

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