a) Write the reaction formula when a radium nucleus of the 225-Ra isotope decays.
b) How much energy is released in the reaction?
c) Suppose that the emitted alpha particle receives all the released energy as motion energy. How high speed does it get then?
d) Suppose you have 10.0 g of the radium isotope from the beginning. After how long is only 1.0g left?
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