A radioactive material has a half life of a day of 30 days you begin wihy 4 grams of radioactive material jow much of thr orginal is lect uncharged after 90 days

0.5 g

Explanation:

Given data:

Half life of radioactive material = 30 days

Total mass = 4 gram

Mass left after 90 days = ?

Solution:

Number of half lives passed:

Number of half lives = Time elapsed / half life

Number of half lives = 90 days / 30 days

Number of half lives = 3

At time zero = 4 g

At first half life = 4g/2 = 2 g

At 2nd half life = 2g/ 2= 1 g

At 3rd half life = 1 g/2 = 0.5 g

true

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