The absorption cross-section at 20 GHz of a water droplet with a radius of 48 m is
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The absorption cross-section at 20 GHz of a water droplet with a radius of 48 μm is about 2 × 10-11 m2. Hence calculate the absorption coefficient of a cloud consisting of droplets of radius 48 μm with a number density of 2 million droplets per cubic metre. Would you expect this cloud to be opaque?
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