4 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Comparing Light Output per Absorbed Photon 4 questions
Comparing Light Output per Absorbed Photon
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A display gives two coatings the same number of absorbed photons. Each incoming photon brings five model energy units. A coating can give back some of that energy as emitted light. In each row all emitted photons have the stated energy.
| Coating | Absorbed photons | Emitted photons | Energy per emitted photon |
|---|---|---|---|
| P | 20 | 12 | 2 |
| Q | 20 | 8 | 3 |
Question 1
Which coating emits more photons per absorbed photon?
- P only
- Q only
- Both emit the same fraction.
- The numbers cannot be compared.
Question 2
Calculate the energy emitted as light by each coating.
Write your answer and work on the printable worksheet, or answer online.
Question 3
A student says a meter that reports equal emitted energy proves the two coatings emit equal photon counts. Evaluate the claim with the table.
Write your answer and work on the printable worksheet, or answer online.
A second detector collects one quarter of the light emitted by P and one half of the light emitted by Q. The detector does not change either coating’s emission.
Question 4
Predict the energy this detector collects from each coating. Explain how to recover the total emitted energy from these new readings.
Write your answer and work on the printable worksheet, or answer online.
2025 Chemistry Reference Tables · Browse Chemistry worksheets