You are at the controls of a particle accelerator, sending a beam of 3.90x107 m/s protons (mass m) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of the unknown element. All such protons rebound with a speed of 3.60x107 m/s. Assume that the initial speed of the target nucleus is negligible and the collision is elastic. Part A Find the mass of one nucleus of the unknown element. Express your answer in terms of the proton mass m. Express your answer as a multiple of m. 15. ΑΣΦ mel= Submit Part B Unucleus = Request Answer Submit What is the speed of the unknown nucleus immediately after such a collision? Express your answer in meters per second. [ΕΙ ΑΣΦ ? Request Answer m ? m/s

You are at the controls of a particle accelerator, sending a beam of 3.90x107 m/s protons (mass m) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of the unknown element. All such protons rebound with a speed of 3.60x107 m/s. Assume that the initial speed of the target nucleus is negligible and the collision is elastic. Part A Find the mass of one nucleus of the unknown element. Express your answer in terms of the proton mass m. Express your answer as a multiple of m. 15. ΑΣΦ mel= Submit Part B Unucleus = Request Answer Submit What is the speed of the unknown nucleus immediately after such a collision? Express your answer in meters per second. [ΕΙ ΑΣΦ ? Request Answer m ? m/s