All radioactive sources have a half-life. Which statement about the half-life of a source is correct?
O A. It is half the time it takes for an atom to decay
OB. It is half the time for the radioactive source to become safe
O
C. It is the time it takes the activity of the source to decrease by half
D. It is half the time it takes the activity of the source to decrease to zero

What are transitions between a liquid and a solid called? identify which way they are transitioning

How many grams of aluminum will there be in 98g of al2o3?

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.