Answer:
1. Data:
a) Half-life: 5730 years
b) Final radioactivity: 68%
2. Solution:
a) <u>Determine the number of half-lives undergone</u>
- Since, <em>the radioactivity has decreased to 68%, means that the carbon-14 contanined is has been reduced in </em> 32%: 100% - 68% = 32%.
- 32 = 2⁵, meaning that five half-lives have passed since the <em>plant material</em> that formed the<em> parchment fragment died</em>.
b) <u>Compute the time of five half-lives</u>:
- 5 × half-life time = 5 × 5730 years = 28,650 years.
c) <u>Round to the nearest hundred:</u>
- 28,650 years ≈ 28,700 years
And that is <em>the age of the parchment</em>.
I think the answer is magnetic field?
Answer:
helium
Explanation:
helium has the highest ionization energy level
Im so sorry i don’t know I just need to answer 2 questions for me to be Able to ask
Cover with metal .Any elements other than hydrozen and helium concentration shows an absorbance
