Question

Technetium-99 has a half life of 8 hours.

How much of a 100 gram sample is undecayed after 16 hours?

Answer 1

50g

Step-by-step explanation:

The half - life of a radioactive material is the time taken for half of a material to decay by half or into half.

The faster the half life the faster the rate of this decay and vice versa.

Now if initially we have 100g of a Technetium - 99;

If the half - life is 8hrs, at every 8 hours, the mass of technetium will decay by half;

So; at 16hrs, the mass of the material will be 50g