After three half lives what fraction of a radioactive sample has decayed

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

How have the greenhouse gasses increased from the year 2000 to 2018