1) How do you produce a standing wave in any material? 2) Explain how the wavelength of a standing wave in a string is r

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1) How do you produce a standing wave in any material? 2) Explain how the wavelength of a standing wave in a string is related to the properties of the string.
4) A string of length L=1.2 m is attached at one end to a wave oscillator, which is vibrating at a frequency f=90 Hz. The other end of the string is attached to a mass hanging over a pulley as shown in the diagram below. A student measures the tension needed to get varying numbers of segments. After manipulating the data, the student uncovers the relationship in the graph below. From these results, what is the linear density of the string?
5) A standing wave is formed in a string as pictured in problem 4. If a standing wave with two segments is formed when the frequency is 60 Hz, and the hanging mass and string length are kept constant, what frequency would be required to produce a standing wave with 7 segments?