Use Equation (4.12) to show that, at low microwave frequencies, the absorption coefficient of a cloud of
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(i.e. independent of the droplet size), where ris the mass of water in kg per m3 of cloud. Assume that, for water at microwave frequencies, εp = 75.9, ε = 4.5 and
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¬'. )dBkm¯ GHz, 0.5 -3 kgm'
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