First slide
Interference
Question

Statement I: It is not possible to have interference between the waves produced by two violins.
Statement II: For interference of two waves the phase difference between the waves must remain constant.

Easy
Solution

Since the initial phase difference between the two waves coming from different violins changes, therefore, the waves produced by two different violins does not interfere because two waves interfere only when the phase difference between them remain constant throughout.

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