After two half-lives or 60 years, 7.5 g of the element will be left.
<u>Explanation:</u>
<u>Half-life:</u>
- In simple words, Half-life can be defined as the amount of time needed for a quantity to fall to half its value as contained at the beginning of the time period.
- In this problem the half-life of the element is thirty years, then after thirty years half of the sample would have decayed and half would be left as it is.
- After thirty years (The first half-life ) 30 /2 = 15 g declines and 15 g remains disappeared.
- And after another sixty years (The two half-lives) 15 /2 = 7.5 g declines and 7.5 g remains disappeared.
- After two half-lives or 60 years, 7.5 g of the element will be left.
It’s a study of unusual behaviors,emotion,and thought hope this helped
The theory is the Continental drift, the super-continent is called the Pangaea.
Answer:
well you didnt give me a link to the story or text so i dont have any info to answer sry ;(
Explanation:
B.
Photosynthesis produces energy which is used during respiration to break down carbohydrates like starch into more usable forms like glucose
