Question

Fill in the blanks1. Chalk appears white because it ...... light ofall colours2. A sunflower appears yellow in sunlightbecause it absorbs the component3. Colours are produce
d in television by theprocess of colour4. The mixing of pigments is a ....... process.5. Green and blue lights mixed in equalproportion produce the colour .......​

Answer 1

Answer: 1 Chalk appears in white colour because of the presence of calcium carbonate in it. ... Such absorbed ultraviolet and infrared rays are reflected out as they are with the same wavelength and hence Chalk appears to be in white colour.

4 Because pigments absorb wavelengths, whenever you mix pigments, you are subtracting wavelengths rather than adding them. Mixing colors by subtracting wavelengths is called subtractive color mixing. When all three primary pigments are mixed together in equal amounts, all wavelengths are subtracted.

5 If all three primary colors of light are mixed in equal proportions, the result is neutral (gray or white). When the red and green lights mix, the result is yellow. When green and blue lights mix, the result is a cyan.

Explanation:

Answer 2

The fill-ups are as follows:

• 1. Chalk appears white because it absorbs light of all colours
• 2. A sunflower appears yellow in sunlight  because it absorbs all the components of light except yellow.
• 3. Colours are produced in television by the process of colour broadcasting with red, green and blue RGB colours
• 4. The mixing of pigments is a chemical process.
• 5. Green and blue lights mixed in equal  proportion produce the colour cyan.