speed of a wave on a stretched string :
v = sqrt(T/(m/L))
density of aluminium, d = 2700 kg/m3
Now, mass , m = d*pi*r^2*L
So, m/L = d*pi*r^2 = 2700*pi*0.001^2 = 8.48*10^-3 kg/m
So, v = sqrt(375/(0.00848))
= 210.3 m/s
So, wavelength = v/f = 210.3/440 = 0.478 m <------ answer
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