4 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Checking a Light Pulse on Two Card Areas 4 questions
Checking a Light Pulse on Two Card Areas
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class tests a light-sensitive display card. Each pulse spreads its energy uniformly over the listed area. The coating changes color in any region that receives at least 3 model energy units per square centimeter during the pulse. Both pulses have the same wavelength.
| Pulse | Total energy (units) | Area illuminated (cm2) |
|---|---|---|
| J | 24 | 6 |
| K | 24 | 12 |
Question 1
Which pulse is predicted to change the coating’s color over its illuminated area?
- J only
- K only
- Both pulses
- Neither pulse
Question 2
Explain why equal total energy and wavelength do not give the same coating result in the two trials.
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A new pulse must cover 10 cm2. The coating still needs at least 3 energy units per square centimeter. The energy remains uniform across the lit area.
Question 3
Calculate the least total pulse energy that would change the color over the new area.
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Question 4
Choose two energy levels to test near the predicted 30-unit threshold. State one condition to keep the same and what pattern would support the prediction.
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