Question

answer the table please

Radioactivity Half Life game - Word Sign in Insert Design Layout References Mailings Review ViewHelp Grammarly Tell me what you want to do Share File Home Cut Format Painter Find Celibri ECopy ˊ Replace Paste Blu-alK Х, Х'A.之一7 ク Normal TNO Spac Heading 1 Heading 2 Title Subtitle Subtle Erm Select Open ,- Font Paragraph Styles Editing Grammarly A Decay Rates Observe the decay curves (% remaining vs time) for carbon-14 and Uranium-238. sketch the decay curve for those isotopes here Carbon-14 Uranium-238 Dating Game Game. Estimate the age of each of the fol Determine how the litle Gelger counter works in Measurement and Dating objects in the list below tem Estimated Age tem Estimated Age 1. Why can't we use Carbon-14 to date the r 2. Why couldn't the fish fossil or dinosaur skull be dated with either C14 or U238? 3. Could Carbon-14 be used to date a hammer suspected of being used in 34008C?Why/Why not? 4. The half-life of the unknown element was about Page 2 of 3 1 of 701 words E 單 昂- + 100% O Type here to search 2-02 PM /15/2019

Answer 1

1.This is because Carbon dating only works for objects that are younger than about 50,000 years, and most rocks of interest are older than 50,000 years so Carbon dating is used by archeaologists to date organisms that has life i.e living organisms and artifacts made from wood and leather,because these items are generally younger than 50,000 years.

2.Fossils are made of bones there is no C-14 or not even carbon in a bone that has been burried in the ground for very long. Fresh bone does have some carbon in it, but it's leached out fairly quickly in the decay process. No living organism incorporates U-238 into itself via metabolic means, in the same way C-14 gets incorporated.So fish fossil or dinosaur skull will not be dated with either C14 or U238.

3. It depends on the materials that were used to make the hammer. If parts of the hammer, like the handle, was made of organic materials and if any of it survived the passage of time, the carbon contained in it can be used to date the hammer. However, if only the hard parts survived and were made of stone or metal, carbon dating cannot be used.

4.There are three steps to solving this equation.

1) Analyze - Your are Given the following:
        The original mass of unknown= 12.0 mg.
        mass of unknown after 4.46 x 10 ⁹ years is 3.00mg
        Time elapsed is 4.46 X 10⁹ years
    - Unknown: half-life of unknown sample

2) Plan - We have to find the number of half-lives that have passed using the mass of the sample.

    #of half-lives = 12.0 mg/2 = 6.00 mg (which is not what we are left with so divide again) 6.00 mg/2 = 3.00mg (so we have gone through two half-lives)

3) Compute - so 2 half-lives took 4.46 x 10⁹ years

4.46 X 10⁹ years/2 half-lives = 2.23 X 10⁹ years is one half-life