Answer these 3 questions. > What percent of the element is left at the 1st half-life? >> What percent of the element is left at the 2nd half-life? >>> What percent of the element is left at the 3rd half-life? (1 point) Responses 1st: 70-80% 2nd: 50-60% 3rd: 24-30% 1st: 70-80% 2nd: 50-60% 3rd: 24-30% 1st: 24-30% 2nd: 50-60% 3rd: 70-80% 1st: 24-30% 2nd: 50-60% 3rd: 70-80% 1st: 12-15% 2nd: 24-30% 3rd: 50-60% 1st: 12-15% 2nd: 24-30% 3rd: 50-60% 1st: 50-60% 2nd: 24-30% 3rd: 12-15%

Answer 1

To determine the percentages of an element remaining after each half-life, we can follow this standard decay process:

• At the 1st half-life, 50% of the original amount of the element remains.
• At the 2nd half-life, 25% of the original amount remains (which is half of 50%).
• At the 3rd half-life, 12.5% of the original amount remains (which is half of 25%).

Based on these calculations:

• 1st half-life: 50% remains.
• 2nd half-life: 25% remains.
• 3rd half-life: 12.5% remains.

Now, looking at the provided responses:

1. 1st half-life: 50-60% is given as a possible response. Correct.
2. 2nd half-life: 24-30% is given as a possible response. Correct.
3. 3rd half-life: 12-15% is given as a possible response. Correct.

The most relevant response from the given options should reflect:

• 1st: 50-60%
• 2nd: 24-30%
• 3rd: 12-15%

Thus, the options that fit best are:

1st: 50-60%, 2nd: 24-30%, 3rd: 12-15% (correct conceptually, although exact values were not specified).