00:01Okay, so here we want to know the half -life of cesium -137 in years.
00:05So when we're looking at this graph, i'm just going to draw a part of it here.
00:12So this tells us that the amount starts at 100.
00:15And to find the half -life, we want to see where our line meets when the amount is now 50, because that's where 50 % of the product has decayed.
00:29So if we look at where this line first intersects, it looks like about here on our graph that we have, and then it continues downward, so on...
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