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प्रश्न
What colours make up white light?
Name the colours that make up white light.
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उत्तर
The seven colours that make up white light are red, orange, yellow, green, blue, indigo and violet.
संबंधित प्रश्न
With the help of a labelled diagram, explain why the sun appears reddish at the sun-rise and the sun-set.
We can see the sun before the actual sunrise by about:
(a) 5 minutes
(b) 2 minutes
(c) 2 hours
(d) 20 minutes
What is the colour of the sunlight:
scattered by the dust particles in the atmosphere?
Which effect is illustrated by the observation that when a beam of sunlight enters a dusty room, then its path becomes visible to us.
Why does the sky appear dark (or black) to an astronaut instead of blue?
The blue colour of sky is due to:
(a) refraction of light
(b) dispersion of light
(c) diffraction of light
(d) scattering of light
Complete the following statement:
When the sun is setting, the light from it has to travel a ................ thickness of the earth's atmosphere and only ................ wavelength ................ light is able to reach us. Sunset is therefore ................
When sunlight enters the earth’s atmosphere, state which colour of light is scattered
- the most and
- which the least.
Describe an experiment to show that “sunlight is essential for photosynthesis”.
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
