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Speed of light = 299,792,458 meter per second = 29,979,245,800 cm per second

Wave Length = λ = 4 x 10-5 cm = 4 / 100000 cm.

So no of waves passing a point per second = 29,979,245,800 x 100000 / 4

= 749,481,145,000,000 = 74,948 billion waves per second

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