Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock is found to contain 83.9% of the amount of uranium-238 that it contained when it was formed. (The amount that the rock contained when it was formed can be deduced from the presence of the decay products of U-238.) How old is the Rock?

years

Explanation:

For a first order reaction constant is given as :

where t = 4.5 billion years

             =   years

Therefore,

   =

Now,

where, C = concentration at present time

            = initial amount

Here,

Therefore,

  years

Thus, the age of the rock is years.

the energy to form plasma comes from heat or electricity in the atmosphere!

sunny~ ☺

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.