- Luminous objects give off radiation.
- Light is transferred by light.
- Light travels in straight lines.
- Light cannot pass through opaque substances.
- Light can pass through transparent substance.
- We cannot see absorbed colours.
- We can see reflected colours.
1. Sun: luminous
2. Moon: non luminous
3. lightbulb: luminous
4. stars: luminous
5. candle: luminous
6. tree: non luminous
A spectrum is the band of colors produced when white light is dispersed, typically by a prism, showing the range of wavelengths of visible light.
Frequency is the number of complete wave cycles that pass a given point per second, measured in Hertz (Hz).
Wavelength is the distance between two consecutive crests or troughs of a wave, usually measured in meters or nanometers for light.
Visible light is the portion of the electromagnetic spectrum that is detectable by the human eye, typically ranging from about 400 to 700 nanometers in wavelength.
Parent Tip: Review the logic above to help your child master the concept of grade 8 science worksheet.
