Answer:
Decay constant is the reciprocal of the time interval in which the number of active nuclei in a radioactive sample reduces to \[I/e\] times of its initial value. (i) \[\gamma \] -rays are similar to \[\text{X}\] -rays. (ii) \[\alpha \] -rays are easily absorbed by matter. (iii) \[\gamma \] -rays travel with greatest speed. (iv) \[\beta \] -rays are similar to cathode rays.
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