Awooden boat is discovered just south of the graet pyramid in egypt had a carbon-14 content of approximately 25% of that found in living organisms. how old is the boat? (the half-life of carbon-14 is 5,715 years.)

Because 25% is half of 0.5 and the half life of is given as 5,715, the time it takes to reach this amount should just be double the half life: 11430 years.

However, in other cases the problem may not have easy numbers, so below is a more mathematical approach.

The half life formula is .

Solving for t gives:

Given information:

Plug in given values and solve for t.

With correct significant figures, this would be 11000 years.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

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