If the half-life of tritium (hydrogen-3) is 12.3 years, how much of a 10 g sample of tritium is present after 250.0 years?

0.0000076 grams

Explanation:

We're given the half life of Tritium to be 12.3 years. In order to find out the amount of substabce remaining:

Let's first find how many 'half lives' are in 250 years.

Now what is half life? It means the time taken for a given quantity of an element to lose half it's mass.

So in 12.3 years we can find that The amount of 250 g of Tritium will be 250/2 = 125 g. In 24.6 years we'll have 125/2 = 62.5 g

So now we can devise a formula:

Where m is the remaining amount and n is th number of half lives in the time given.

Using this formula we can calculate:

Doing this calculation we get:

As we can see a very small value remains.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

a=d/t

a="triangle"v/t

explanation:

a = acceleration