There are 5.0g of I-131 left after 40 days. How many grams were in the original sample if the half-life is 8 days?

Evaluate this exponential expression,8. (2 + 3)2 – 42

What is the solubility of substance?

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?