Aradioactive substance has a decay rate of 0.073 per minute. how many grams of a 120 gram sample will remain radioactive after 30 minutes? round the answer to the nearest tenth of a gram, and do not include the unit in your answer.

13.4 grams of a 120 gram sample will remain radioactive after 30 minutes.

Step-by-step explanation:

Given : A radioactive substance has a decay rate of 0.073 per minute.

To find : How many grams of a 120 gram sample will remain radioactive after 30 minutes?          

Solution :

Using decaying formula,  

Where, is the initial amount

r=0.073 is the decay rate

t=30 minute is the time

Substitute the value in the formula,

Therefore, 13.4 grams of a 120 gram sample will remain radioactive after 30 minutes.

(-1,-0.5)

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