# (I) Define Nuclear Fission. (Ii) Rewrite and Complete the Following Nuclear Reaction by Filling in the Atomic Number of Ba and Mass Number of Kr. - Physics

Short Note

(i) Define nuclear fission.
(ii) Rewrite and complete the following nuclear reaction by filling in the atomic number of Ba and mass number of Kr.

""_92^235U +""_0^1n → ""__^144 Ba +""_36^_ Kγ +3""_0^1 n +Energy

#### Solution

(i) Nuclear fission
When a heavy nuclei (generally A > 170), is there, its binding energy per nucleon is very less to make the system stable, so it breaks into smaller fragements. This process is calles nuclear fission.

""_92^235U +""_0^1n → ""_underline(x)^144 Ba +"" _36^underline(y) Kγ +3""_0^1 n +Energy

Z_(LHS) =Z_(RHS)

92 = 36 + x +0

92 - 36 = x

56 = x

A_(LHS) = A_(RHS)

235+ 1 =144 + y + 3

236 - 147 = y

89= y

Now ""_92^235U +""_0^1n → ""_56^144 Ba +"" _36^89Kγ +3""_0^1 n +Energy

Concept: Nuclear Fission
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