medium · Enhanced ACT science
Two tables describe the properties of different light sources used in a botany experiment.
(Wavelength):
| Source | Peak Wavelength (nm) |
| :--- | :--- |
| Lamp A | 450 (Blue) |
| Lamp B | 660 (Red) |
| Lamp C | 550 (Green) |
(Absorption):
| Chlorophyll Type | Max Absorption Wavelength (nm) |
| :--- | :--- |
| Type 1 | 430 - 470 |
| Type 2 | 640 - 680 |
Based on these tables, which lamp would be LEAST effective for a plant containing only Chlorophyll Type 1 and Type 2?
- Lamp C is the least effective because its peak is not absorbed.
- Lamp A is the least effective because it has the shortest wavelength.
- Lamp B is the least effective because red light carries less energy.
- Lamp A and B are equally ineffective due to spectral overlap.
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