3. A radioactive isotope has a half-life of 17days. If a chemist has a sample of 200g, howlong will it take until there is 25g of the sample? Also calculate the activity of the radioisotope at this point (note that activity A = Nλ).​

Rank the six combinations of electric charges on the basis of the electric force acting on q1. define forces pointing to the right as positive and forces pointing to the left as negative. rank positive forces as larger than negative forces. q1,q2,q3 = positive(+) q1 = + q2 = + q3 = - q1 = + q2= - q3= + q1= - q2= + q3= + q1= + q2= - q3= - q1,q2,q3 = negative