A string of length 40 m, with both ends fixed, vibrates in one of its normal modes. Its displacement is always null in only 3 points, including the endpoints. It is known that the speed of propagation of waves on this string is 7 m/s. Calculate the wavelength and angular frequency. Choose the correct alternative

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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.