Recall that m(t) = (1/2)^t/h for radioactive decay, where h is the half-life. Suppose that a 500g sample of phosphorus-32 decays to 356g over 7 days.

The question is incomplete, here is the complete question:

Recall that m(t) = m.(1/2)^t/h for radioactive decay, where h is the half-life. Suppose that a 500 g sample of phosphorus-32 decays to 356 g over 7 days. Calculate the half life of the sample.

The half life of the sample of phosphorus-32 is

Step-by-step explanation:

The equation used to calculate the half life of the sample is given as:

where,

m(t) =  amount of sample after time 't' = 356 g

= initial amount of the sample = 500 g

t = time period = 7 days

h = half life of the sample = ?

Putting values in above equation, we get:

Hence, the half life of the sample of phosphorus-32 is

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step-by-step explanation: