https://apps.explorelearning.com/gizmos/student-class/2102512

1. What is the half-life of Isotope A in the Half-life Gizmo. Use the 'Theoretical decay' setting to determine its half-life.

A. 45 seconds

B. 17 seconds

C. 20 seconds

D. 31 seconds

100 seconds

2. What is the half-life of Isotope B in the Half-life Gizmo. Use the 'Theoretical decay' setting to determine its half-life.

A. 17 seconds

B. 45 seconds

C. 31 seconds

D. 100 seconds

E. 20 seconds

3. Which isotope in the Half-life Gizmo is the most radioactive?

A. Isotope A

B. Isotope B

4. Is the relationship between number of atoms N vs. time exponential (curved), or linear (straight line)?

If you haven't done it yet, look at the chart in the graph tab of the Gizmo.

Exponential (curved)

Linear (straight line)

5. Substance X has a half-life of 10 years, if you start with 1000 grams, how much will be left after 30 years?

A. 125 grams

B. 30 grams

C. 500 grams

D. 250 grams

E. 333 grams

6. According to the "Many Worlds" interpretation of quantum mechanics, when you perform an experiment and observe a particle,

A. you pick a parallel universe where the particle exists in the location you observe it.

B. you pick the only parallel universe where the particle exists at all, there is not other versions of it on any other parallel universe.

C. All the existing parallel universe collapse into the only one where the particle exists where you observed it.

7. The "Cosmological Interpretation" of Quantum Mechanics is an extension of

A. The "Many Worlds" interpretation

B. The Copenhagen interpretation

8. What do the "Hidden Variable Theories" try to explain?

A. Non-locality

B. The uncertainty principle

C. Quantum tunneling

D. Quantum computing