5. IE • 238U undergoes alpha decay as follows:

92 238 90 234 2

4 238 050 786 234 043 583 4 002 603 U Th He u u u

→ +

( . ) ( . ) ( . )

(a) Do you expect the Q value to be (1) positive,

(2) negative, or (3) zero? Why?

(b) Find the Q value.