The atomic bomb was tested in New Mexico prior to the bombings. I'm pretty sure they knew what it could do.
And if your belief still stands, what would have been the better solution to get the Japanese to surrender. In my opinion. Hiroshima and Nagasaki were just some major shoves to stop...
Do you believe that the atomic bombings of Hiroshima and Nagasaki during WWII justified?
If not, what do you think would have been the better solution?