Radioactive iodine is used to determine the health of the thyroid gland it decays according to the equation y=ae^-0.0856t where t is in days find one fourth life of this substance

16.19 days.

Step-by-step explanation:

The radioactive iodine is used to determine the health of the thyroid gland and it decays according to the equation where t is in days and a is the initial amount and y is the final amount after decay for t days.

We have to find a one-fourth life of this substance.

So,

⇒

Now, taking ln both sides we get,

ln (0.25) = - 0.0856t ln e {Since, }

So, t = 16.19 days. (Answer)

i would go with the first one

step-by-step explanation:

hope this

step-by-step explanation:

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