The student's lab group (Group ) uses the string to create a basic musical instrument, shown in Figure 2, consisting of a string of effective

The student's lab group (Group Δ) uses the string to create a basic musical instrument, shown in Figure 2, consisting of a string of effective length l. 

String Figure 2 The students realize that another lab group (Group B) made their instrument with an effective string length of 21. The students observe that when both strings oscillate at their fundamental frequency, the frequencies are the same. 

In a clear, coherent, paragraph-length response that may also contain equations and drawings, state how both the resulting standing waves on the strings and the emitted sound waves are the same and/or different between the two groups' instruments.

String, Peg Figure 2