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wave lenght(λ)=speed of light(c)/frequency(v)

λ=c/v

c= 3*10^8 m/s

v=6.84*10^14 s^-1

λ=3*10^8/6.84*10^14

λ=0.4385 * 10^-6

λ=4.4 * 10^-7

hope the answer has been given to ur question

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