An Alpha Particle Is Emitted from a Radioactive Source with an Energy

question 9

Multiple Choice

An alpha particle is emitted from a radioactive source with an energy of 5 MeV. How fast is it moving (in m/s) ? (m = 4.002 603 u, 1 u = 1.66 × 10−²⁷ kg.)

• A) 2.4 × 10⁷
• B) 1.6 × 10⁷
• C) 3.7 × 10⁷
• D) 4.6 × 10⁷
• E) 2.1 × 10⁷