Question

how atom bomb blasts

Answer 1

$\bold\red{\underline{\underline{Atomic\:bomb:-}}}$

→It is based on uncontrolled chain reaction.

→The shape and size of the fassionable material is so adjusted at the time of explosion that it reaches the over-critical stage.

___________________________

→In the atom bomb, a few pounds of fissionable material ( 235U or 239Pu) is taken in the form of a number of separate pieces; each piece is in subcritical stage (surface area is very large, i. e., loss of neutrons is high.)

___________________________

→At the time of explosion, these pieces are driven together rapidly by using explosives like TNT (trinitro toluene) lying behind each of 235U pieces as to make one large piece of fissionable material. At this instant, the over-critical stage is achieved and a fast chain reaction is set- up. This results in a violent explosion with the release of tremendous amount of energy.

___________________________

→On account of explosion, the fragments fly apart with tremendous speeds. These collide with each other and kinetic energy is changed to heat energy. The amount of energy liberated in an atomic. explosion is of the order of the detonation of about 20,000 or 30,000 tons of TNT raising the temperature to about 10^7° C.

___________________________

$\bold{\underline{\underline{Some\:Historical\:Fact}}}$

→The first atomic bomb dropped over Hiroshima city during the second World War in 1945 utilised 235U and the second atomic bomb dropped on Nagasaki made use of 239Pu.

→India exploded their first atomic bomb at Pokhran in Rajasthan in May 1974, and used 239Pu as the fissionable material.

___________________________

Thank You ❤

@swigy

___________________________