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प्रश्न
The danger signal is red. Why?
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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.
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संबंधित प्रश्न
Name a natural phenomenon which is caused by the dispersion of sunlight in the sky.
What did Newton demonstrate by his experiments with the prism?
What colours make up white light?
Name some everyday objects:
which absorb all the colours in sunlight
In an experiment to study the scattering of light by passing a beam of white light through a colloidal solution of sulphur in a transparent glass tank:
Which colour is observed from the front of the glass tank? Does this colour correspond to the colour of sky on a clear day or the colour of sky around the sun at sunset?
What characteristic property of light is responsible for the blue colour of the sky?
The clouds are seen white. Explain
Which phenomenon is responsible for making the path of light visible?
Which of the following statements is correct regarding the propagation of light of different colours of white light in the air?
How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon?
