1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
grandymaker [24]
3 years ago
6

A rock is radiometrically dated to determine its age. The laboratory doing the dating discovers that the rock currently has 200

atoms of radioactive parent isotope and 600 atoms of stable daughter product.
Assuming that the rock had 800 atoms of radioactive parent isotope and 0 atoms of daughter product at the time it formed, how old is the rock, if the half-life of the radioactive isotope is 1,000,000 years?
Geography
1 answer:
Soloha48 [4]3 years ago
6 0

Answer: The rock is 2000785 years old.

Explanation:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant

t = age of sample

a = initial amount of the reactant  = 800

x = amount of daughter isotope = 600

a - x = amount left after decay process = amount of parent isotope = (800-600) = 200

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.693}{1000000}=0.000000693years^{-1}

t=\frac{2.303}{0.000000693}\log\frac{800}{200}

t=2000785years

The rock is 2000785 years old.

You might be interested in
Mention and explain five causes of climate change ​
mixer [17]

Answer:

Cause #1: Variations in the Sun's Intensity

The Earth receives its warmth from the sun, so it's reasonable to suspect that our home star may be one of the reasons for global warming. Although the amount of energy coming from the sun does vary and may have been responsible for warming in the past, however, NASA and the Intergovernmental Panel on Climate Change (IPCC) have ruled this out as a cause of the current warming trend. The average energy coming from the sun generally has remained constant since 1750, and the warming does not occur uniformly throughout the atmosphere. The upper layer is actually cooling as the bottom layer becomes warmer.

Cause #2: Industrial Activity

Since the Industrial Revolution, humans have been burning fossil fuels such as coal and petroleum for energy, which releases carbon dioxide into the atmosphere. A quarter of this is for heat and electricity, while another quarter is for other industrial processes and transportation, which includes gasoline- or diesel-powered cars, trucks, trains and airplanes. The other half of the energy is used for various other purposes, including agriculture, cement production and oil and gas production. These processes also release other greenhouse gases, such as methane and CFCs, although the concentration of CFCs has declined since their use was banned in 1988.

Cause #3: Agricultural Activity

The agricultural practices that produce food for the people on earth is another of the human causes of climate change. The use of both commercial and organic fertilizers releases nitrous oxide, a powerful greenhouse gas. Methane, another important greenhouse gas, comes from many natural sources, but also from the digestive systems of livestock raised for meat production as well as the decomposition of waste in landfills and the burning of biomass.

Cause #4: Deforestation

The increased demand for meat and dairy cattle has lead to the creation of feed lots in otherwise forested areas. Logging for wood and paper and clearing for crop production also requires trees to be cut, sometimes illegally. One mature tree absorbs as much as 48 pounds of carbon dioxide each year, and by one estimate, 3.5 to 7 billion are cut every year. According to Scientific American, deforestation is responsible for 15 percent of the greenhouse gases in the atmosphere.

Cause #5: Earth's Own Feedback Loop

As the atmosphere warms, it is able to hold more water, which is already the most abundant greenhouse gas. This creates a feedback loop that accelerates global warming. It also creates more clouds, rainstorms and other symptoms of climate change. At the poles, the warming of the atmosphere melts the ice cover, exposing water, which is less reflective than ice. The water absorbs the sun's heat, and the oceans also become warmer as a result.

Explanation:

hope this helps you should reword a little just in case;)

-Ryleigh

8 0
3 years ago
Which option contradicts the motion of the earth?
Alex73 [517]

Answer:

The answer is probably A

6 0
3 years ago
The first division of settlements in Brazil was called:
n200080 [17]

The answer is captaincies, hope it helps

4 0
3 years ago
Read 2 more answers
What factor made Southeast Asia one of the world’s great geographic crossroads?
hichkok12 [17]
Its location makes it a natural meeting place<span>
</span>
5 0
3 years ago
Read 2 more answers
Which season occurs in the Northern Hemisphere when the Sun is at its lowest point in the sky?
goblinko [34]

Answer:

fall

Explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • The process of approving the Constitution is best described as
    8·2 answers
  • An Ecosystem is the interaction of plant and animal life with the physical environment in which they live. True or false
    6·1 answer
  • The land for the capital was taken from tge states of
    5·1 answer
  • What is likely to occur when the pacific plate slides under?
    12·1 answer
  • If two continents of equal size were to collide and become one, how would the total area of continental shelf space associated w
    6·1 answer
  • Classify the planets as terrestrial planets or gas giants
    13·2 answers
  • Outline how marine environments can be valuable for energy production.​
    5·1 answer
  • This picture shows a
    10·1 answer
  • Why do you think society's don't take every precaution necessary to prevent man-made disasters from impacting the environment an
    6·1 answer
  • Identity the number that goes with each physical feature (due soon :,) )
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!