Which option was changed in the "waves" lab to see how it would affect wave speed?

a length of string
b how hard the string was plucked
c type of string
d tension of string

Option-(B): How hard the string was plucked

Explanation:

Observing the speed of light in a string:

The speed,s of the waves generated from a source can be analyzed well by making some number of changes but to know how hard the string was plucked, we will get an idea of the medium's flexibility or its ability to move in a more smooth wave as the energy,E transfer occurs through it. The energy,E transfer through the string is mainly considered as more of a longitudinal waves. We know well about the transfer of energy in the longitudinal forms, as it has two main regions the rarefaction and the compression. When the energy is more or in dense form it is the point of compression, while to make some changes in the position of the string plucked in can be very easily analyzed by the observer. As the position or point where the string is plucked can be a very distinguishing factor due to the fact that angle between the destination and the receiving end matters a lot in the wave propagation.