State the reason why light nuclei usually undergo fusion and heavy nuclei usually undergo fission.

Assertion: Energy is released when heavy nuclei E undergo fission or light nuclei undergo fusion. Reason: For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decrease with increasing Z.

200 MeV energy is released when one nnucleus of .^(235)U undergoes fission. Find the number of fissions per second required for fissions per second required for producing a power of 1 megawatt.

If 200 MeV of energy is released in the fission of one nucleus of ""^(236)_(92)U , the number of nuclei that must undergo fission to release an energy of 1000 J is,

State of matter which does not undergo compressibility.

Why the animals that lives in burrows usually wander during night time only?