3. When the quantum of radioactive substance
is increased two times, the number of atoms
disintegrating per unit time is
a. Doubled
b. Increased by square of two
c. Increased but not to a great extent
d. Not affected
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Answer:
Radioactive disintegration obeys first order reaction kinetic, i.e. rate of reaction is directly propotional to the initial amount.
−
dt
dN
=kN
Therefore, increasing the amount of radioactive substance two fold rate of disintegration is doubled.
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