7. The D string on a guitar oscillates with a fundamental frequency of 146.8 Hz. Its length is 0.640 m, and in its fundamental mode this length is one half-wavelength. (a) What is the speed of waves traveling along this string? (b) if the linear mass density of this guitar string is 2.3 × 10−3 kg/m, what is the tension in the string? (c) The string sends out sound waves of the same frequency through the air, traveling at a speed of 345 m/s. What is the wavelength of these sound waves?

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A: Explanation and calculations are in next step .

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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.