A) exothermic change which increases or decreases with temperature
B) increases on applied pressure
C) nuclear process does not depend on external factors
D) none of the above
Correct Answer: C
Solution :
Radioactive decay is a nuclear process that is, the radioactive rays are emitted from the nucleus of the atom. The process cannot be accelerated or slowed down by any physical or chemical process {e.g., by changing temperature, pressure etc.). This is because the energy of chemical change is of the order of 1 eV whereas nuclear energy is of the order of millions of electron-volt. So, a charge of 1-2 electron-volt of energy cannot affect the nucleus. Similarly, ordinary temperature change cannot affect the rate of decay in radio-active material. Intact, this process is a spontaneous disintegration of nucleus.
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