a. 60.6 \mathrm{Bq} / \text { Litter }b. 40.6 d

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Christina K.

Rutgers, The State University of New Jersey

Andy C.

University of Michigan - Ann Arbor

Other Schools

Jared E.

University of Winnipeg

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{'transcript': "in this question we want to find I want to see activity in the milk due to naturally occurring potassium. I settled right three assuming when he told me Has two grams off the rotation. So you're the first find Want to see number off rotation in money talks milk. So when he told milk two grams softball TZ um divided by D. Monem s off. What? A sandwiches to 9.1 grams football. So give us a number off Bulls quotation, multiplying Piety. Uh oh, God. Jesus. Number six point. You're to report any tree to get rusty number off new place. Not from here. We know that the isotope k 40 right? That is the rotation 40. There's not radioactive isotope. It's about 0.117% off the entire population off potential. So we can actually me that define this number off rotation 40 k 40 by multiplying in key. That's your point, Teoh. 117 percent right. Every shirt gets about 2.6 sent for 80 the cinema off radioactive new kites. Flotation 14 Your flights To fight e activity, we need to take the decay constant multiply party number off, Morticia. 40. Right. The decay constant is going to over the half Life you half life for petition for these given to be boat one point to it times 10 to the po. Off night. Yes. Multiplying this by she won 56 This will convert it from years. Two seconds. This number of seconds in the year. What everybody? A number of new kites, which is 3.6 step over 18. No activity. It's about 61.8. The case for a second or just cruise. Compare this to the amount of radio activity and milk which is due to the Odin. Just 2000 back rows. Right. This is a pretty small amount compared to the should have. Ah, extent that has costed increasing radio activity not to fight how long it would take before the activity to fall below that off deportation. But we know that the activity is boat. It starts right? Currently it's about 2000 back groups. Right? For one liter we wanted to drop to 61 point yet backhoes I saw a It goes to a not for my explanation agree from the tea that is by DTK law So, given that our we want our in the show to be 2000 final to be 61.8. So what if I d a Not over. I love 50 exponential till on the right, you will take the natural lock on both sites. Gets negative love, not tea. So a t or be close to one over Lambda Times Lawn 2000 over 61 point. So basically the negative sign, cause I just divide by dated negative Lambda and the negative Lunda will cost the, uh no, Carrie don't function to flip de infection right now. What is the Lambda for duty, Right? This goes too long to three courses reversed. So, though, is t half over onto, but he her office about eight points. You're four days by long to we're evaluating this Ugo uncertainty in terms off days, which is 40 point tree days."}

National University of Singapore
Christina K.

Rutgers, The State University of New Jersey

Andy C.

University of Michigan - Ann Arbor

Other Schools

Jared E.

University of Winnipeg