Which of the following affect(s) the half-life of a radiocative substance?

a. the addition of a catalyst.

b. the temperature of the substance.

c. the mass of the substance.

d. the type of isotope.

check all that apply.

!

option (D)

Explanation:

The half life of a radio active substance is defined as he time in which the activity of radioactive substance becomes half. For example let the halflife of a radioactive substance is T, it means its activity becomes half in time T.

The relation between halflife T and decay constant K is

T = 0.6931 / K

The half life of a radioactive substance is independent to the mass of substance, temperature of substance and the addition of catalyst.

It is different for different isotopes.

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