Name The Year: John Paul II becomes 1st pope to visit a communist country (Poland).?

Questions

first japanese winner of the nobel prize for literature?

which nobel laureate renounced his knighthood in 1919 following the amritsar massacre of 400 indian demonstrators by british troops?

who discovered radioactivity in uranium?

what was the old term for hydrogen?

who, while working in cambridge, was the first to calculate, accurately, the density of the earth?