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प्रश्न
The colour of sky, in direction other than of the sun, is blue. Explain.
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उत्तर
As the light travels through the atmosphere, it gets scattered in different directions by the air molecules present in its path. The blue light due to its short wavelength is scattered more as compared to the red light of long wavelength. Thus the light reaching our eye directly from the sun is rich in red colour, while the light reaching our eye from all other directions is the scattered blue light. Therefore, the sky in a direction other than in the direction of the sun is seen blue.
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संबंधित प्रश्न
Which colour of the spectrum has
longest wavelength,
How many colours are there in a full spectrum of white light? Write the various colours of spectrum in the order, starting with red.
Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.
Which of the two is scattered more easily, light of shorter wavelengths or light of longer wavelengths?
State whether the following statements are true or false:
The scattering away of red light makes the sky appear blue during the day time.
What colour does the sky appear to an astronaut?
The blue colour of sky is due to:
(a) refraction of light
(b) dispersion of light
(c) diffraction of light
(d) scattering of light
Using the phenomenon of scattering of light, explain why there is a difference in the colour of the sun as it appears during sunrise and at noon.
State the difference in colours of the sun observed during sunrise/sunset and noon. Give explanation for each.
Blue litmus is added to two test tubes A and B containing dilute HCl and NaOH. Answer respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
