I'm not sure how to solve this type of problem. Detailed steps would be very helpful, please.  The intensity of a sound wave is 100 W/m2 at a distance of 3 m. a. What is the intensity of the sound wave at a distance of 6 m? b. What is the intensity at 9 m?

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Q: what is the proper formula for part a?

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Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.