Why Is the Color of Clear Sky Blue
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(a) refraction of light (b) dispersion of light
(c) diffraction of light (d) scattering of light
Violet has the smallest wavelength, but colour of the sky is blue. why?
most of the violet rays are absorbed by the atmosphere.
our eyes are less sensitive to violet colour.
both (a) and (b)
neither (a) nor (b)
- True
- False
The sky appears blue and red (during sunrise and sunset). It is due to the scattering of light by the
dust particles in the atmosphere
water droplets in the atmosphere
in the atmosphere
none of these
Red color is used in danger signal because it scatters to a wider angle.
False
True
Why the colour of sky appear in blue colour
- minimum wavelength and less scatter.
- less wavelength and less scatter.
- maximum wavelength and less scatter.
- maximum wavelength and more scatter.
Demonstrate the phenomenon of scattering with a help of an activity
(a) The scattering away of red light makes the sky appear blue during the day time.
(b) The scattering away of blue light makes the sun appear red at sunset.
Why do clouds appear white or greyish in color? Why not any other particular color?
(a) gas molecules present in air (b) dust particles present in air
(c) water droplets suspended in air (d) soot particles present in air
The above diagram shows the arrangement for observing scattering of light in colloidal solution, why does the beaker appear blue?
because of scattering of blue light only
because of scattering of red light
because no scattering happens
none of these
- Orange all the time
- Orange at sunrise and sunset
- Black
- Blue
- Sunlight travels longer distance at sunrise and sunset
- Near the horizon it passes through thick layers of atmosphere having larger particles
- Both A and B
- None of the above
Why are the danger signals coloured red?
Because red light scatters the most
None of these
Because red light undergoes total internal reflection
Because red light scatters the least
Blue colour of the sky is due to
Refraction of light
Reflection of light
Scattering of light
Dispersion of light
- Yellow
- Green
- Red
- Blue
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Both Assertion and Reason are incorrect
Consider the following statement and choose the incorrect one (s).
- The blue color of the clear sky is due to the presence of the atmosphere on the earth.
- The greyish appearance of the sky is due to the presence of smoke and dust particles in the atmosphere.
- Emergency signals and danger signals are red because red lights can travel long distances without being scattered.
- When electromagnetic waves strike a matter, then scattering takes place.
I, IV
I, II, IV
II, IV
none of these
Why does sky appears blue ?
Due to total internal reflection of light
Due to the mixture of hot air and cold air
Due to atmospheric refraction
Fine particles in the air scatter blue light more than red light
Define scattering of light?
- None of these.
- When sunlight enters the atmosphere, fine air particles scatter blue colour more than red. The scattered blue light enters our eyes.
- When sunlight enters the atmosphere, fine air particles scatter all the colours other than the blue colour thus the blue colour reaches our eyes.
- When sunlight passes through the atmosphere, the blue light gets dispersed the most.
- Yellow
- Blue
- Red
- Green