Question

Explain the following:
i.) Out of blue and red light, which one is scattered more and why? [2 marks]
ii.) What is colour of danger signals? Why? [2 marks]

Answer 1

i.)
The amount of scattering is inversly proportional to the wavelength of the light. [1 Mark]
Blue light has a shorter wavelength while the red light has a longer wavelength. Due to this, blue light scatters more. [1 Mark]

ii.)
Danger signal is red in colour. Red colour scatteres the least when it strikes the small particles of fog and smoke because it has the maximum wavelength in the visible spectrum. [1 mark]
Hence at large distances also, we can see the red colour clearly. This is the reason red colour is used in danger signals. [1 mark]