A Proton and an Electron Are Accelerated Until Their Total

question 39

Multiple Choice

A proton and an electron are accelerated until their total energy is twice their rest masses.If the rest mass of the proton is M_pc² = 931 MeV and that of the electron is M_ec² = 0.51 MeV,the ratio of the velocity of the electron to that of the proton is

• A)0.5
• B)1.0
• C)1.5
• D)2.0
• E)not enough data are given

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