Mark 1 nuclear bomb
E850515
The Mark 1 nuclear bomb, also known as "Little Boy," was the first nuclear weapon used in warfare, dropped by the United States on Hiroshima, Japan, in 1945.
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
fission bomb
ⓘ
gun-type nuclear weapon ⓘ nuclear weapon ⓘ |
| approximateYieldTNT |
13–18 kilotons
ⓘ
15 kilotons ⓘ |
| carriedBy | B-29 Superfortress NERFINISHED ⓘ |
| category |
Nuclear bombs of the United States
ⓘ
World War II weapons of the United States ⓘ |
| cityCasualtiesEstimate | tens of thousands killed immediately ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| dateOfUse | 1945-08-06 ⓘ |
| deliveryMethod | aerial bomb ⓘ |
| designedAs | gun-type assembly ⓘ |
| designReliability | considered highly reliable due to gun-type design ⓘ |
| detonationAltitude |
about 1,900 feet
ⓘ
about 600 meters ⓘ |
| detonationType | air burst ⓘ |
| developedBy |
Manhattan Project
NERFINISHED
ⓘ
United States Army NERFINISHED ⓘ |
| diameter |
about 28 inches
ⓘ
about 71 centimeters ⓘ |
| droppedBy | United States Army Air Forces NERFINISHED ⓘ |
| droppedByAircraft | Enola Gay NERFINISHED ⓘ |
| era | Cold War precursor ⓘ |
| firstOfType | first nuclear weapon used in warfare ⓘ |
| fissileCoreType | uranium projectile and target ⓘ |
| followedBy |
Fat Man design family
ⓘ
Mark 3 nuclear bomb ⓘ |
| hasAlias | Little Boy NERFINISHED ⓘ |
| historicalSignificance |
first atomic bomb used in combat
ⓘ
initiated nuclear warfare era ⓘ |
| length |
about 10 feet
ⓘ
about 3 meters ⓘ |
| mass |
about 4,400 kilograms
ⓘ
about 9,700 pounds ⓘ |
| museumExhibit | replicas displayed in various museums ⓘ |
| operator | United States Army Air Forces NERFINISHED ⓘ |
| precededBy | Manhattan Project test devices ⓘ |
| program | Manhattan Project NERFINISHED ⓘ |
| safetyTesting | no full-scale nuclear test before combat use ⓘ |
| targetCity | Hiroshima NERFINISHED ⓘ |
| targetType | urban area ⓘ |
| usedAgainst | Hiroshima NERFINISHED ⓘ |
| usedAgainstCountry | Japan NERFINISHED ⓘ |
| usedBy | United States NERFINISHED ⓘ |
| usedInConflict | World War II ⓘ |
| usesFissileMaterial | uranium-235 ⓘ |
| warheadType | pure fission ⓘ |
| yearOfUse | 1945 ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.