Question

Q.Why is red colour selected for danger signal lights?

Answer 1

Here is your answer.

 Wavelength of red colour is more and so, it is least scattered. It can be easily seen through a large distance.

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Answer 2

Question :-

Why is red colour selected for danger signal lights?  

Answer :-

According to the range of wavelengths , red has the highest wavelength .

Thus red can reach a long distance in a short period of time.

Also the red wave is the least scattered .

Thus it does not get refracted easily and hence it is effective for long distances.

So red light is used as a signal light .

Thus red light is chosen and no other colour is better suitable for signals.

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