Quiz

Question

Question 1 (3 points)

Listen
Based on your work in the half-life gizmo from today's lesson, in activity A, question 5, what pattern do you see in your data?

Question 1 options:

the number of radioactive atoms gets multiplied by 2 every 10 seconds

the number of radioactive atoms is divided by 10 every 2 seconds

the number of radioactive atoms is approximately divided by 2 every 10 seconds

the number of radioactive atoms gets multiplied by 10 every 10 seconds

Question 2 (3 points)

Listen
Based on your work in the half-life gizmo from today's lesson, in activity A, question 8, what was the number of radioactive atoms for 30 seconds?

Question 2 options:

16

4

128

64

Question 3 (3 points)

Listen
Based on your work in the half-life gizmo from today's lesson, in activity B, question 2, what is the exact half-life of isotope A?

Question 3 options:

33

31

60

55

Question 4 (3 points)

Listen
Based on your work in the half-life gizmo from today's lesson, in activity A, question 8, what was the number of radioactive atoms for 50 seconds?

Question 4 options:

32

128

64

4

Question 5 (3 points)

Listen
Based on your work in the half-life gizmo from today's lesson, in activity B, question 3, how many "actual" radioactive atoms were there after 4 half-lives?

Question 5 options:

16

8

4

124

0 of 5 questions saved
Listen

Answer 1

Here are the answers based on common principles related to half-life processes:

Question 1:
The pattern in radioactive decay generally indicates that the quantity of radioactive atoms decreases by half after each half-life period. Therefore, the correct option is:
the number of radioactive atoms is approximately divided by 2 every 10 seconds.

---

Question 2:
If you apply the concept of half-lives over 30 seconds, and assuming a standard half-life model, the atom counts would depend on the initial amount and the number of half-lives that have occurred in that duration. If the initial number was 128, after 30 seconds (considering three half-lives of 10 seconds each), it would be 16. Thus, the answer is:
16.

---

Question 3:
Based on typical half-life values and their corresponding durations, without specific initial data, you would often find half-lives around common durations. Assuming typical results, the likely answer could be:
33.

---

Question 4:
Continuing from a situation where 30 seconds had 16 atoms and considering another 20 seconds (two additional half-lives), the remaining number from 16 atoms after another two half-lives would be 4. So the answer is:
4.

---

Question 5:
After 4 half-lives, you would continue to halve the number of radioactive atoms based on the initial quantity. If you started at 128 atoms, it would reduce as follows:

• After 1 half-life: 64
• After 2 half-lives: 32
• After 3 half-lives: 16
• After 4 half-lives: 8

Thus, the answer would be:
8.

---

Please verify the initial quantities used in your specific gizmo for accurate calculations.