The radionuclide `.^(238)U` decays by emitting an alpha particle. `.^(238)Uto.^(234)Th+.^(4)He` The atomic masses of the three isotopes are `.^(238)" "U 238.05079 am u`

`.^(234) U" "234.040363 am u`

`.^(4) He " " 4.00260 am u` What is the maximum kinetic energy of the emitted alpha particle. Express your answer in Joule. (`1am u = 1.67 xx 10^(-27)kg`)

A. `6.8xx10^(-14) J`

B. `6.8xx10^(-13) J`

C. `4.3xx10^(-14) J`

D. `4.3xx10^(-13) J`