`^64Cu ` (half - life = 12.8 h) decays by `beta` emission (38%) , `beta^(+)` emission (19%) and electron capture (43%) Write the decay products and calculate partial half - lives for each of the decay processes.

Potassium-40 can decay in three modes .It can decay by beta^(-) -emission, beta^(+) -emission or electron capature. (a) Write the equation showing the end products. (b) Find the Q-value in each of the three cases. Atomic masses of _18^40(Ar) , _19^40K and _20^40(Ca) are 39.9624 u,39.9640 u,and 39.9626 u respectively.

.^(40)K is an unusual isotope, in that it decays by negative beta emission, positive beta emission, and electron capture. Find the Q values for these decays.

Nuclei of .^(64)Cu can decay be electron capture (probability 61%) or by beta^(+) decay (39%). Half life of .^(64)Cu is 12.7 hour. Find the partial half life for electron capture decay oricess,