1. What is the wavelength of wave A?
The wavelength is the distance between two consecutive crests or troughs. For wave A, measuring from one crest to the next gives approximately 2 cm.
2. What is the frequency of wave B?
Frequency is the number of waves passing a point per second. Wave B has fewer cycles in the same space compared to wave A, indicating a lower frequency. Without a time scale, we can only say it’s less than wave A’s frequency.
3. Which wave carries more energy? Why?
Wave A carries more energy because it has a higher frequency and shorter wavelength. Energy is directly proportional to frequency (E = hf).
4. Which wave would represent a visible wave? Why?
Neither wave A nor B represents a visible wave as drawn, since visible light wavelengths are in nanometers (400–700 nm), not centimeters. However, if scaled appropriately, wave B with its longer wavelength could represent red light, and wave A could represent violet light within the visible spectrum.
5. Which colors would appear when pigments are mixed?
- Red + Blue → Purple (or Magenta)
- Red + Yellow → Orange
- Blue + Yellow → Green
- Red + Blue + Yellow → Brown or Black (depending on proportions)
6. What color will appear when pigments are mixed?
Mixing all three primary pigments (cyan, magenta, yellow) typically results in black or dark gray, as they absorb most wavelengths of light.
7. What color of light is reflected by an object that appears white?
White objects reflect all colors of visible light.
8. What color of light is absorbed by an object that appears black?
Black objects absorb all colors of visible light.
9. Why do you see a clock in a dark room?
You cannot see a clock in a completely dark room unless there is some source of light (e.g., glowing hands, ambient light, or a flashlight). Vision requires light to reflect off objects and enter your eyes.
10. How is an image formed differently from a translucent object?
- Opaque object: Blocks all light; no image formed behind it.
- Translucent object: Scatters light; allows partial visibility but blurs images.
- Transparent object: Allows light to pass through clearly; forms sharp images.
Parent Tip: Review the logic above to help your child master the concept of properties of light worksheet.
