An Unknown Particle in an Accelerator Moving at a Speed

question 43

Multiple Choice

An unknown particle in an accelerator moving at a speed of 2.00 * 10⁸ m/s has a measured total energy of 1.22*10^-9 J. What is its mass? (c = 3.00 * 10⁸ m/s)

• A) 1.49 *10^-26 kg
• B) 0.650 *10^-26 kg
• C) 0.810 *10^-26 kg
• D) 1.01 *10^-26 kg