8a. Explosive device whose energy is provided by nuclear fission. My problem is that I cannot decide between a-bomb or h-bomb. I think it is A-bomb???????.
Ah;I'm glad you asked me that question--one of the few things I remember about Physics!A-bomb uses fission,H-bomb fusion!So you're right:Chambers says so!
Thank you Greedykite, I was reading about the two types of bomb for ages, I think that I was slowly turning into a kind of Professor Quatermass, anyway crossword now completed.