4
votes
2answers
114 views

What was the efficiency of the “Gadget” bomb in the Trinity Test?

I've done a bit of searching and was unable to find what I expected to be a simple statistic. By "efficiency" I mean the percentage of the Plutonium in the bomb that actually fissioned.
1
vote
2answers
104 views

Non-voluntary deferments in WWII?

This question comes from an interview I conducted many years ago. The question about drafts reminded me. The subject was a grad student and medical researcher. His research project was canceled and he ...
2
votes
2answers
197 views

Why did America not know about soviet espionage in manhattan project

I was watching pbs documentary Behind Closed doors. According to that documentary Churchill and Roosevelt were not really sure if Stalin really understood about 'the new kind of weapon' when they ...
1
vote
1answer
62 views

What was the extent of influence of James Byrnes on President Truman in the decision to use nuclear weapons?

Secretary of State James Byrnes was a very influential man and played a key role in foreign policy and the negotiations during WW2. It is known that after the death of FDR, he was the one who informed ...
5
votes
1answer
157 views

When was General Douglas MacArthur made aware of the Manhattan Project?

Considering the US government's low opinion of General MacArthur* even before he almost performed a military coup in the 1950s: Was Douglas MacArthur ever made aware of the Manhattan Project before ...
0
votes
1answer
193 views

Why were all Y-12 operators of Manhattan Project women?

I have searched a while and I have not found any evidence of why all operators at Y-12 had to be women. I am interested especially in in two aspects: Who was the person from inside of the project ...
18
votes
4answers
5k views

Why didn't the US choose to demolish Tokyo with an atom bomb?

Tokyo was Japan's capital. Why didn't the US choose Tokyo to demolish with Atom Bomb? Bonus Question: What factors decided to bring Hiroshima and Nagasaki on table?
18
votes
1answer
4k views

Did the United States have a third atomic bomb to drop on Japan?

On 15 August, six days after the bombing of Nagasaki, Japan announced its surrender to the United States, signing the instrument of surrender on 2 September, officially ending the war. The question ...
9
votes
5answers
1k views

Why did the Germans fall behind the Americans in the development of the atomic bomb after an initial lead?

I actually know certain facts about this matter, but am seeking guidance in interpreting these facts into "theories." 1) Theory 1, Economic: The Americans spent something like $2 billion (in money of ...
17
votes
7answers
3k views

Why did the US drop nuclear bombs on a weakened Japan?

Why did the United States drop two nuclear bombs on the Japanese mainland? It appeared that Japan was ready to surrender.
8
votes
2answers
395 views

Plans for More Nuclear Warfare in Japan during WW2

When reading about Operation DownFall I noticed that if Japan had not surrendered following the nuclear bombs at Hiroshima and Nagasaki there could have been at least 7 more Nuclear Bombs ready for ...
5
votes
2answers
2k views

Were the atomic bombings of Hiroshima and Nagasaki necessary? [closed]

The United States bombed Hiroshima on August 6, 1945. Before the Japanese could surrender, they bombed Nagasaki on August 9, 1945. The two bombs killed over 200,000 people, most of them civilians. ...