Proton radioactivity is an unusual type of radioactive decay that occurs when a proton is ejected from a nucleus. During a nuclear experiment, proton (mass 1 u) emission was observed from the decay of ⁵³₂₇Co (mass 53 u). The proton's speed in the laboratory frame was measured to be 1.42 × 10⁷ m/s. Find the recoil speed of the daughter nucleus ⁵²₂₆Fe.

• A. 2.73 × 10⁵ m/s
• B. 7.23 × 10⁶ m/s
• C. 1.07 × 10 ⁷ m/s
• D. 1.42 × 10⁷m/s

Answer: (A)