For each of the following situations, identify whether Young’s modulus or Bulk modulus should be substituted for E in the formula v=E/ρ and justify your choice with one reason.
a. (a) A longitudinal wave set up in a piano wire
b. (b) A pressure pulse travelling through diesel fuel in a pipeline
c. (c) A disturbance propagating along an aluminium rod used as a tuning fork
d. (d) A compression wave moving through the water column of a well