Misc: what's the process of splitting atoms called?

Questions

This group named itself after an 18th century agronomist.?

This group's name comes from a term used for a 1911 firetruck?

This group's name was inspired by reports of Sinatras move to the film industry?

This group's name was inspired by the hit "Strawberry Fields Forever"?

Painter of most of Joni Mitchell's album covers?