1.ν-?
υ=5000м/с
λ=6,16м
υ=λν
ν=υ/λ
ν=5000/6,16=811,7Гц
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1.ν-?
υ=5000м/с
λ=6,16м
υ=λν
ν=υ/λ
ν=5000/6,16=811,7Гц