lecture-Nov20

The Hydrogen Bomb Homework

• Homework 4 assigned, due in two weeks. Practice problems and solutions posted.

Failure of Baruch Plan to Control Atomic Weapons

• Proposed by Bernard Baruch to place atomic weapon control under the UN; rejected by Russia due to objections on Western control and US atomic stockpile.

Soviet Nuclear Development

• First Soviet atomic bomb, "Joe 1," detonated on August 29, 1949 – a plutonium-based copy of the U.S. "Fat Man" with 22 kT yield.

Espionage and the Development of the Bomb

• Russian spy network revealed U.S. bomb plans; Klaus Fuchs leaked information and was imprisoned.

• Espionage led to advancements in Soviet uranium techniques and early access to U.S. atomic designs.

The Rosenbergs and Espionage

• Julius and Ethel Rosenberg executed for conspiracy linked to Fuchs' confession, with weaker evidence against Ethel.

The Korean War (1950-1953)

• North Korea invaded South Korea; the U.S. considered nuclear weapons but did not deploy them. Approximately 34,000 American soldiers died.

Senator McCarthy's Hearings

• McCarthy claimed numerous communists within the U.S., leading to his Senate censure due to unsubstantiated claims.

Nuclear Energy: Fission and Fusion

• Nuclear energy from fission and fusion; fusion in the sun converts hydrogen into helium, releasing energy.

Advantages of the Hydrogen Bomb

• Fusion yields greater energy output than fission and requires lower mass materials.

Nuclear Weapon Testing and Developments

• IVY Mike (1952): First thermonuclear test; impractical weapon. Castle-Bravo (1954): Largest U.S. test, yielding 15 MT.

Electromagnetic Pulses (EMPs)

• Nuclear explosions can generate EMPs disrupting communications, especially from high-altitude detonations.