Answer / kashkxh

because when 400hz is in the freqency the the speed increses
the light speed so lowers the size reduction

Answer / yuvaraj

required high speed.high frequency used getting high speed

Answer / sorav

because large value of frequency means,lower value of time,
so,signals are transferred with more accuracy.

Answer / joan serra

400Hz are used to avoid pilot and/or co-pilot epilepsy

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