Figure 1 shows the wavelengths of some types of electromagnetic radiation.
Suggest one device or material that can be used to detect infrared radiation.
Which of the following values is a wavelength of red light?
- 320 nm320\text{ nm}320 nm
- 480 nm480\text{ nm}480 nm
- 540 nm540\text{ nm}540 nm
- 700 nm700\text{ nm}700 nm
An agricultural monitoring drone carries a multispectral imaging sensor that is sensitive to electromagnetic radiation with wavelengths between 300 nm300\text{ nm}300 nm and 1050 nm1050\text{ nm}1050 nm. Give two ways the range of radiation detected by this drone sensor is different from the range of radiation detected by healthy human eyes.
Complete the sentences. Choose the answers from the box:
| absorbed | emitted | reflected | refracted |
When sunlight shines on a green leaf, the green light is ____________.
All other colours of light shining on the green leaf are ____________.
A student looks at the green leaf through a red filter. How does the leaf appear to the student?
- Black
- Blue
- Green
- Red
The student also looks at the reflection of the leaf in a calm, undisturbed puddle of water. What type of reflection happens at this very smooth water surface?