# shaziya fission.pptx

Mar. 28, 2023

### shaziya fission.pptx

1. FISSION AND FUSION BY : SHAZIYA KHAN BSC M.I.T (2nd SEMESTER )
2. HISTORY: Hahn & Strassman Meitner & Frisch  In 1939 They First Identified the nuclear fission.  Explained Hahn & Strassman results.  Instead of heavier Uranium , it had split into smaller elements = Nuclear Fission. Their Statement Was :  Bombarded Uranium -235 samples with neutrons expecting the Uranium – 235 to capture neutrons.
3. A LITTLE BIT ON THE ATOM:
4. NUCLEAR FISSION A reaction in which an atomic nucleus of a radioactive element splits by bombardment from an external source , with simultaneous release of large amount of energy , used for electric power generation.
5. CHAIN REACTION  A chain reaction occurs when a critical mass of uranium undergoes fission .  Releasing a large amount of heat and energy that produces an atomic explosion.
6. NUCLEAR FISSION DIAGRAM
7. ENERGY FROM FISSION Each uranium-235 atom ha a mass of 3.9014 x 10-25 kg. The total number of atom in 1kg of uranium-235 can be found as follows: No. of atoms in 1kg of uranium-235 = 1/3.9014 x 10-25 . No. of atoms in 1kg of uranium-235 = 2.5 x 10-24 atom.
8. ENERGY FROM FISSION If one uranium-235 atom undergoes a fission reaction and release 2.385 x 10-11 J of energy , then the amount of energy released by 1 kg of uranium- 235 aca be calculated as follows: Total energy per fission x number of atoms Total energy = 2.385 x 10-11x 2.56 x 1024 Total energy = 6.1056 x 10 13 J
9. NUCLEAR POWER PLANT In nuclear power plants: Fission is used to produces energy. Control rods in the reactor absorb neutrons to slow and control the chain reactions of fission.
10. FISSION CAN BE USED:  GOOD A controlled chain reaction in a reactor used in nuclear power plant to produce electricity.  EVIL An uncontrolled chain reaction is used to create incredibly powerful weapons – the atomic bombs dropped on Japan.
11. NUCLEAR FUSION  Nuclear fusion is the process by which multiple nuclei joins together to form a heavier nucleus.  It is accompanied by the release or absorption of energy depending on the masses of the nuclei involved. 2H + 3H 4He + 1n + Energy 1 1 2 0
12. FUSION : SMALL NUCLEI FROM LARGER NUCLIDE , RELEASE ENERGY
13. ENERGY FROM FUSION 2H + 3H 4He + 1n + Energy 1 1 2 0 m = 3.1 x 10-29 Kg E = mc2 C = 3x 108 ms-1 E = 3.1 x 10-29 x (3 x 108)2 E = E E = 2.79 x 10 -12 J The energy released per fusion is 2.79 x 10-12 J.
14. FUSION CAN BE USED  GOOD A controlled reaction in a reactor used to produce cleaner , inexpensive electricity.  EVIL A fission bomb starts a fusion chain reaction to create an incredibly powerful weapon – thermonuclear weapons (H-bombs), MUCH more destructive than atomic bombs.
15. THANK YOU