fun fact for today a humming bird can remember the last time they went to a flower so they do not go to it for 2 days but after a whole day they visited over 500 flowers.So, they remember the 100 flowers that they have visited already that are spreaded out. Nobody really knows how a humming bird with a very small brain can do that.
Exponential growth.........,,......
<h3><u>Answer;</u></h3>
Potassium-40 has a half life of 1.25 billion years.
<h3><u>Explanation;</u></h3>
New amount = Original amount × (1/2)^n ; where n is the number of half lives.
Original amount is 50 atoms
New amount is 25 atoms
Therefore;
25 = 50 × (1/2)^n
1/2 = (1/2)^n
Thus; n = 1
n = 1 which is equivalent to 1.25 billion years
Therefore;
<u>Potassium-40 has a half life of 1.25 billion years.</u>