Protons cannot be so easily added to an atom, so this method cannot be used to produce ions. Protons are found in the nucleus which is held together by strong forces. This means that its structure is not easily changed. Bombarding it with a proton may even cause its decay, just as in nuclear fission a nucleus is bombarded with neutrons.
Because 25% is half of 0.5 and the half life of
is given as 5,715, the time it takes to reach this amount should just be double the half life: 11430 years.
However, in other cases the problem may not have easy numbers, so below is a more mathematical approach.
The half life formula is
.
Solving for t gives:
![t=\frac{h*\ln(\frac{A}{A_0} )}{\ln(\frac{1}{2} )}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7Bh%2A%5Cln%28%5Cfrac%7BA%7D%7BA_0%7D%20%29%7D%7B%5Cln%28%5Cfrac%7B1%7D%7B2%7D%20%29%7D)
Given information:
![A=0.25A_0\\h=5715\text{ yrs}](https://tex.z-dn.net/?f=A%3D0.25A_0%5C%5Ch%3D5715%5Ctext%7B%20yrs%7D)
Plug in given values and solve for t.
![t=\frac{5715 *\ln(0.25) }{\ln(\frac{1}{2} )} =11430 \text{ yrs}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B5715%20%2A%5Cln%280.25%29%20%7D%7B%5Cln%28%5Cfrac%7B1%7D%7B2%7D%20%29%7D%20%3D11430%20%5Ctext%7B%20yrs%7D)
With correct significant figures, this would be 11000 years.
Answer:
rocks beneath the surface melt seems like the answer that makes the most sense
Answer:
How does the equilibrium change with the removal of hydrogen (H2) gas from this equation? 2H2S ⇌ 2H2(g) + S2(g) A. ... Equilibrium shifts left to produce less reactant.
Explanation:
option A is the correct answer
Equilibrium shifts right to produce more product.
I hope it will help you.