Question

нσℓα!!


ᵂᴴᴬᵀ ᴵˢ ᴴᴬᴸᶠ ᴸᴵᶠᴱ ᴬᴺᴰ ᴹᴱᴬᴺ ᴸᴵᶠᴱ ​

Answer 1

Answer:

I think half life is half living of life

and mean life meaning helping and enjoyful life

Answer 2

The terms half-life and mean life are both factors pertaining to radioactive decay.  

Half Life

• The half-life (T½) is the time required for either the radioactivity or the number of radioactive atoms to decay to half of the initial value.

• After one half-life, the activity is ½ of the initial value, after two half-lives it is ¼, and so on.  

• The equation for half-life is

$\boxed{\bf T\frac{1}{2} =\dfrac{0.693}{k}}$  

• k represents the decay constant.  

Mean Life

• The mean life (Ta) is the average lifetime of a radioactive atom before it decays.  

• It is the sum of the lifetimes of all the individual nuclei divided by the total number of nuclei involved.  

• Mean life is used to determine the total number of disintegrations or the emitted radiation.  

• Emitted radiation is equal to the activity Ta.  

• Mean life is longer than the half-life.

The relationship between the two is

$\boxed{\bf T_a=1.44\times T\frac{1}{2}}$