Johannes Wilhelm "Hans" Geiger (; German: [ˈɡaɪɡɐ]; 30 Septemba 1882 <unk> 24 Septemba 1945) bụ onye German bụ ọkà mmụta sayensị. A maara ya nke ọma dị ka onye na-emepụta ihe nchọpụta nke Geiger counter na maka Geiger <unk> Marsden nnwale nke chọpụtara na atomic nucleus. Ọ bụ nwanne nke meteorologist na climatologist Rudolf Geiger. Ajụjụ: Onye chọpụtara na atomic nucleus.
Johannes Wilhelm "Hans" Geiger