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9 Distinguish between a progressive wave and a stationary wave. Explain in detail how you would use a sonometer to establish the relation between the fundamental frequency of a stretched wire and: that mais from one position to mental (a) its length; wo whas moving in apposit Geo was moving in opposite girlson bark same ampli will that passes away what transformim (b) its tension. You may assume a set of standard tuning-forks and set of weights in steps of half a kilogram to be available. A pianoforte wire having a diameter of 0-90 mm is replaced by another wire of the same material but with diameter 0-93 mm. If the tension of the wire is the same as before, what is the percentage change in the frequency of the fundamental note? What percentage change in the tension would be necessary to restore the original frequency? (L.)

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