A violin and a sitar may have the same frequency, yet we can distinguish between their notes. Why ?

Explain why (or how) : (a) In a sound wave, a displacement node is a pressure antinode an dvice-versa, (b) Bats can ascertain distances, directions, nature and size of obstacles without any eyes, (c) a violin note and sitar note may have the same frequency, yet we can distinguish between the two notes, (d) Solids can support both longitudinal and transverse waves, but only longitudinal waves can propagate in gases, (e) The shape of pulse gets distorted during propagation in a dispersive medium.

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Assertion : Our ears cannot distinguish two notes,one produced by a violin and other by a sitar, if they have exactly the same intensity and same frequency Reason:When a musical instrument is played it produces a fundamental note which is accompanied by number of overtones called harmonics