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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
Why does the sun seem to rise two minutes before the actual sunrise and set two minutes after the actual sunset ? Explain with the help of labelled diagram.
Which color of white light is scattered the least and why?
Which colour of the spectrum has
longest wavelength,
Where in nature can you find evidence that white sunlight may be made of different colours?
What colour does the sky appear to an astronaut?
Why does the sky appear dark (or black) to an astronaut instead of blue?
Sunset is red because at that time the light coming from the sun has to travel:
Explain in brief the reason for the following :
Advanced sunrise
Which phenomenon is responsible for making the path of light visible?
Blue litmus is added to two test tubes A and B containing dilute HCl and NaOH. Answer respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
