Recent content by Minkowski

It is a continuous stream/release I thought this: I know that the half-life is 10,8 years. I need to find a mass that enables the Kr-85 decay to release 2 grams/day. There must be an equation since it's impossible for me to calculate it since the half-life is an eks. function. I know the...

Homework Statement A power plant releases 2,0 grams of Kr-85 into the atmosphere every day. At some point there's an equilibrium between what the power plant releases into the atmosphere and the decay in the atmosphere -> The decay in atmosphere is equal to 2,0 grams per day Calculate the...

Homework Statement - A guy sees a rock falling from a plateau. He estimates the last third (1/3) of the rocks fall to last for 1,3 sec. Air resistance doesn't need to be taken into consideration. - How far/what distance has the rock fallen? Homework Equations None given The...

Yep, I am aware of that. The problem recided in the proper use of intensity - I wasn't sure if the 805 counts/sec. should be understood as intensity. You've been a great help, Thanks alot.

I've made a big mistake: I wasn't aware that the graph was printed on "exp-paper", that's why it made a straight line. I should have known this, since I made an experiment 2 weeks ago, that resulted in an exponential declining function. I know that k = ln(2)/T½ I know both ln(2)...

I've got a graph: 805 counted decays at the beginning of the 25 months. This graph is declining linearly with a = -40 counts/mm. e.g. 765 counts at 1 mm. paper, 725 at 2 mm. and so forth. What do I do with that info.? I think it's my understanding of measured intensity (counts/time), or lack...

Hello, This is my first post here, and I must say I'm in trouble caused by the last problem in my homework assignment. I live in Denmark so excuse me if some of the terms are not correct English. What I do know: Source: Ti-204, Decay: Beta-, Activity: 3,1MBq, Half-life period: 3,8 years...