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***The velocity of a wave on a wire or string is not dependent (to a close approximation) on frequency or amplitude and is given by v ^{2} = T/µ, where T is the tension in the wire and µ is the linear mass density. The linear mass density is the mass per unit length of wire, so that the linear mass density µ is the product of the mass density and the cross-sectional area.*

*A certain wire A (see figure) has tension 2000 N and a circular cross section of diameter 0.4 mm. A sine wave is traveling to the right with frequency 200 Hz.*

*Wire B is made of the same material as wire A with half the diameter.*

How would the cross-sectional area change if the diameter were increased by a factor of 4?