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प्रश्न
Why are the ‘danger signal’ lights red in colour?
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उत्तर
Danger signal lights are red because this colour has the longest wavelength among all the colours. Also, it is the least scattered by fog, dust and smoke particles. This makes red light visible even from a longer distance.
संबंधित प्रश्न
Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the colour of the sky be for an astronaut staying in the international space station orbiting the earth? Justify your answer giving reason.
What did Newton demonstrate by his experiments with the prism?
What is meant by dispersion of white light? Describe the formation of rainbow in the sky with the help of a diagram.
What colour does the sky appear to an astronaut?
What is tyndall effect? Explain with an example.
Explain in brief the reason for the following :
Advanced sunrise
Explain in brief the reason for the following :
Delayed sunset
Why is the Tyndall effect shown by colloidal particles?
At noon the sun appears white as:
The clear sky appears blue because
