Which of these statements about ionising radiation are true:
a) ionising radiation can transfer enough energy to break molecules apart.
b) theta radiation is a type of ionising radiation.
c) unstable atoms can emit three types of ionising radiation.

there may be multiple correct answers.

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.