The Physics
Hypertextbook
Opus in profectus

# Fission

## Problems

### practice

1. Write a fission bomb question that could be used in both the fission and nuclear weapons sections.
2. Write something about a fission reactor.
3. Write something — a fission weapon question that could be reused in the section on nuclear weapons if possible.
4. A nucleus is a ball of positively charged protons glued together with the help of uncharged neutrons. Splitting a nucleus into two roughly equal halves increases the overall separation between the protons and reduces their electrostatic potential energy. Determine the fraction of the original electrostatic potential energy released in an idealized fission reaction.

### statistical

1. yield-to-weight.txt
The efficiency of a nuclear weapon is often stated as a yield-to-weight ratio — the energy released after the weapon detonated divided by the mass of all its parts (nuclear fuel, conventional explosive, triggers, casing, etc.) before it detonated. The practical limit for all forms of nuclear weapon is thought to be 6 kt/kg (kilotons per kilogram). Identify the weapon that comes closest to this limit and state its yield-to-weight ratio. The accompanying tab-delimited-text file provides the following information for all publicly known weapons designed and built in the United States from 1945-1991:
1. Designation (the "make and model" of the device)
2. Type of device (bomb, warhead, artillery shell, or demolition munition)
3. Weight in english pounds (1 kg = 2.2 lbs)
4. Maximum explosive yield in kilotons of TNT
Source: Sublette, Carey. Complete List of All US Nuclear Weapons. Nuclear Weapon Archive. 14 October 2006.