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Answers
Answer:
(4) sky appears dark to an astronaut because there are no particles in outer space to scatter the sunlight
II.
(5) though violet light has shorter wavelength than blue light, sky appears blue because our eyes are more sensitive to blue than violet
(6) In daytime, sun is straight above the surface of the land and hence feel hot. but in evening/morning we receive slanty sunlight, which feel cool.
(7) danger lights are in red colour because red light is the least scattered in the atmosphere, due to its longer wavelength and hence can be seen through large distance.
(8) When a ray of light passes through colloidal solution, it is scattered by minute particles in the solution thus making is path visible as beam. this phenomenon is known as Tyndall effect
Explanation:
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