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The daughter isotope is 87.5 percent if the half-life of the isotope is 150 million years how old is the sample?
To find the age of the sample, we need to determine how many half-lives have passed based on the daughter isotope percentage. Since the daughter isotope is 87.5% present, it means 12.5% has decayed from the parent isotope. Since 1 half-life would result in 50% decay, we can divide 12.5% by 50% to get 0.25 half-lives. Therefore, the sample is approximately 150 million years (half-life) x 0.25 = 37.5 million years old.
How many animals live in the rainforests?
Although rainforests cover only about a tenth of the Earth's surface, they are home to at least half of the world's species of animals and plants - that's thousands of insects alone. About 1.5 million people also live in the rainforests.
How many species of plants can you find in the rainforest and how many?
a rainforest has hundreds even thousands of species of plants.
How many ice ages in the last million years?
There have been around eight ice ages in the last million years, with each ice age lasting for tens of thousands of years. These ice ages were characterized by the expansion of glaciers and ice sheets over large portions of the Earth's surface, resulting in cooler temperatures and lower sea levels.
A rock originally had 1500 atoms of U-235 and it now has 750 how old is it?
For a rock to have started with 1500 atoms of any element and now have 750 it has undergone radioactive decay equal to one full half life (i.e. there are half the number of atoms now than at the beginning).Uranium-235 has a half life of 7.038×108 years.As such, the rock is 7.038×108 or 703 million years old.
How many thousands are there in one half of a million?
a million is 1000 thousands so half a million is 500 thousands.
How many thousands of dollars in a half a million dollars?
500,000 = half a million
How many thousands in half million dollars?
500,000 dollars, if a million is 1,000,000 then half is 500,000
How many thousands equal half a milliom?
500 thousand equal half a million - not milliom.
How much thousands in one half of a million?
500
How many thousands in a one million?
There are 1,000 thousands in one million.
How many thousands are in 50 million?
There are 50,000; thousands in 50 million.
How many thousands are in 19.3 million?
There are 19,300 thousands in 19.3 million
How many thousands are in one million?
There are one thousand thousands in one million.
How many 100 thousands in a million?
There are ten (10) 100 thousands in a million.
How many 10 thousands are in a million?
There are 100 ten thousands in a million.
How many hundred-thousands are in 1 million?
There are 10 hundred-thousands in a million.
