Advertisements
Advertisements
प्रश्न
The danger signal is red. Why?
Advertisements
उत्तर
Since the wavelength of red light is the longest in the visible light, the light of red colour is scattered the least by the air molecules of the atmosphere and therefore the light of red colour can penetrate to a longer distance. Thus red light can be seen from the farthest distance as compared to other colours of same intensity. Hence it is used for danger signal so that the signal may be visible from the far distance.
APPEARS IN
संबंधित प्रश्न
Name some everyday objects:
which reflect all the colours in sunlight
Name some everyday objects:
which absorb all the colours in sunlight
Which phenomenon makes us see the sun:
a few minutes before actual sunrise?
What happens when a beam of sunlight enters a dusty room through a window? Explain your answer.
Why are the 'danger signal' lights red in colour?
When sunlight enters the earth’s atmosphere, state which colour of light is scattered
- the most and
- which the least.
What characteristic property of light is responsible for the blue colour of the sky?
The colour of sky, in direction other than of the sun, is blue. Explain.
State the difference in colours of the sun observed during sunrise/sunset and noon. Give explanation for each.
The bluish colour of water in deep sea is due to ____________.
