suppose that the function represents the number of grams of a radioactive substance at time days. if , how long does it take grams of ths substance to be reduced to grams?

How many neutrons does a atom of cobalt have?

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line