All categories

3 years ago

Which pair of elements can be used to determine the age of a fossil that is over one billion years old?

Chemistry

3 answers:

AnnZ [28]3 years ago

7 0

Answer: Option (4)

Explanation: The most efficient radioactive method used for the determination of fossil age which is about one billion years old is the Potassium-Argon method (⁴⁰K-⁴⁰Ar).

Potassium-Argon method is generally used to date fossils which are more than 1.2 billion years old as its half life is almost about 1.2 billion years. Potassium is highly radioactive, which converts into Argon and becomes stable.

Uranium and Carbon are also highly radioactive whereas Lead and Nitrogen are stable elements.

¹⁴C-¹⁴N is not an efficient method as it has a half life of only about 5700 years.

Thus the correct answer is option (4).

lakkis [162]3 years ago

3 0

Answer:

Explanation:

There are some radioactive nuclides can be used to measure time on an archeological scale. One is the best example of this is radiocarbon dating. This process is based on the ratio of caebon-14 to carbon-12 in the atmosphere which is relatively constant.

The half time of C-14 5730 years

Carbon-14 is a radioactive nucleus. It has a half-life of 5730 years.

All living tissues like plants and animal absorbed carbon-12 along with carbon-14 with same ratio of caebon-14 to carbon-12 in the atmosphere.

Carbon-14 dating is based on the ratio of carbon-14 to carbon-12 in the atmosphere which is relatively constant

Cat 1012 years ago

0 0

It is D, or the last one, or potassium, which is radioactive, and argon, which is stable. lol!

You might be interested in

The science of molecules and and their is called chemistry

GarryVolchara [31]

Is this supposed to be a question?????

6 0

3 years ago

Read 2 more answers

Someone help me Explain how non-genetic factors can affect phenotype. Give an example.

Yanka [14]

Answer:

one could be the weather.

phenotypes are physical characteristics of a person and there non genetic factors that play a role.

weather and environmental factors, your surroundings and orders related to the environment basically

6 0

2 years ago

A very old tree limb contains an amount of carbon-14 that is approximately 1/8 of the current atmospheric 14C levels.. Calculate

Tomtit [17]

A. The radioactive decay equation is N = N0 $e^{-ln(2)*t/T }$

where T is the half-life (5730 years), N0 is the number of atoms at time t = 0 and N is the number at time t.

Rewriting this as:

(N/N0) = $e^{-ln(2)*t/T }$

Since N = (1/8) N0 and substituting known values:

1/8 = $e^{-ln(2)*t/5730}$

Taking ln of both sides:

ln(1/8)= -ln(2)*t/5730

t = - 5730 * ln(1/8) / ln (2)

t = 17,190 years

The tree was cut down 17,190 years ago.

B. N0 = 1,500,000 carbon-14 atoms

Since N = (1/8) N0

N = 187,500 carbon atoms left

3 0

3 years ago

Classify each of the following chemical reactions.

natulia [17]

1. Synthesis or Combination reaction
2. Double replacement reaction
3. Single Replacement reaction
4. Decomposition reaction

Please mark as brainliest if this helped!

7 0

3 years ago

Read 2 more answers

blood plasma for average adults has a volume of 3100mL. if the density of plasma is 1.020 g/mL, what mass of plasma is in the av

Gnoma [55]

Answer:

The volume of blood plasma in adults is 3.1 L. it's density is 1.03 g/cm3.

Explanation:

4 0

3 years ago