For r, would it be best if it's nearest to the hundredth or the thousandth?
well, that depends on a lot of things. what would your professor want? how many decimal places does your text usually use? etc. follow those guidelines. personally, i use as many decimal places as possible, and then round off my final answer if required
well, that depends on a lot of things. what would your professor want? how many decimal places does your text usually use? etc. follow those guidelines. personally, i use as many decimal places as possible, and then round off my final answer if required
He asked to give the answer to the nearest thousandths of a gram.
It says:
Einsteinium (254Es) has a half-life of 270 days. How much of a 5-gram sample would remain after 2160 days?
You don't need logarithms for this. Saying its half-life is 270 days means you multiply by 1/2 every 270 days. 2160/270= 8 so 2160 days is 8 270 day perionds: 5 gms will be multiplied by 1/2 8 times: 5(1/2)^8= 5/256 grams.
You don't need logarithms for this. Saying its half-life is 270 days means you multiply by 1/2 every 270 days. 2160/270= 8 so 2160 days is 8 270 day perionds: 5 gms will be multiplied by 1/2 8 times: 5(1/2)^8= 5/256 grams.