A sample of rock is found to contain 100 grams of a parent isotope. How many grams of the parent isotope will remain after two h
2 answers:
Answer:
Option D - 25
Step-by-step explanation:
Given : A sample of rock is found to contain 100 grams of a parent isotope.
To find : How many grams of the parent isotope will remain after two half-lives.
Solution : A sample of rocks contain parent isotope = 100 gram
After one half life of the parent isotope i.e. divided by 2
After two half lives of the parent isotope means again divide one-half life by 2
Which means 25 gram of the parent isotope will remain after two half lives.
Therefore, Option D is correct -25
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Answer:
Step-by-step explanation:
so the question lets us know 3 things:
1) Sarah has a 27 ft pipe
2) she cuts 6 ft off
3) she cuts remaining pipe into 7 equal sections
what we don't know from the question is how big each of those 7 sections were. To form the equation we do this.
Since we know Sarah has 27 ft of pipe that would be our answer of the equation.
Sarah also removed 6 ft and the rest of the pipe she cut up into 7 small sections of equal length. since we don't know the length of the 7 smaller sections we will use the variable X to represent the length. this means that 6ft + 7x (X is the length of the pipes, and we multiply by 7 since there are 7 of them) must equal Sarah's total length of 27ft, therefore meaning our education would be
to solve for how long each pipe was, we need to solve for X by rearranging the equation as shown bellow.