6 The half-life of carbon-14 is 5,700 years. A sample of wood that originally contained 100 grams of carbon-14 now contains only 25 grams of carbon-14. Approximately how many years ago was this sample part of a living tree? * (6 Points)​

The correct answer is - 10400 years.

Explanation:

Half-life an element is the time required to decay the half amount of the initial amount of the element.

Here, the initial amount n(i) = 100 gm

remained amount n(r) = 25 gm

then n =?

The formula for the calculating initial amount

n(i)=n(r)⋅2^n

n(i)=n(r)⋅2^n

n(i)/n(r) =2^n

puting value,

100/25 = 2^n

2^n = 4

n = 2

so to decay this amount there is two half life cycles involved,

Thus, time = 2*5700

= 10400 years.

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i