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karunasagar

why did the traffic control authority use the red light for showing to halt.. ? scientific

PRATHAB

accoring to rayleigh scaterring law the amount of light scaterred in inversely proportional to to fourth power of the wave lenght of light .
since red light has the longest wave lenght it is less scaterred and hence used in traffic lights

pantpranav

Red light has the longest wavelength & hence is least scattered.

Hence it is easily visible & used in traffic lights.

rudra.panda

Red light has the longest wavelength and therefore is less scattered.

So it is used.

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