Use evidence from Graph 1 to describe the effectiveness of the forecast models used to predict tsunamis, and explain two ways in which the forecast models were less accurate in modeling the actual tsunami data.

answer; i believe that the correct answer is (a) potassium(k)

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error