Answer:Half life is the period of time after which half amount of element is decayed.Half life of rhodium = 30 secAmount of rhodium = 500 gramshow to write the equation, if we know the half life and starting or initial amount of rhodium is:N = 500 g (1/2)^(t / 30 sec) t is the time andN is the amount of rhodium left at time t.
Explanation: