1) Smallest insect length = 1 wavelength
wavelength = velocity/ frequency
= 343 m/s/ 7.99x10^4Hz
length = 4.29E-3 m = 4.29 mm
Smallest insect bat can detect = 4.29 mm
2) Speed = sqrt (tension/mass per unit length) = sqrt(1250/4.9*10^-3) = 505.07 m/s
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