a sample of a radioisotope has a mass of 20 grams. after 2 days, only 10 grams of the radioisotope remains…

a sample of a radioisotope has a mass of 20 grams. after 2 days, only 10 grams of the radioisotope remains unchanged. what is the half - life of this radioisotope?\na 1 day\nb 2 days\nc 5 days\nd 4 days

a sample of a radioisotope has a mass of 20 grams. after 2 days, only 10 grams of the radioisotope remains unchanged. what is the half - life of this radioisotope?\na 1 day\nb 2 days\nc 5 days\nd 4 days

Answer

Explanation:

Step1: Define half - life concept

Half - life is the time it takes for half of a radioactive substance to decay.

Step2: Analyze given data

The initial mass is 20 grams and after 2 days, 10 grams remain. Since 10 grams is half of 20 grams, the time it took for half of the radioisotope to decay is 2 days.

Answer:

B. 2 days