Jim is speeding toward James Island with a speed of 24 m/s when he sees Betsy standing

Question:

Jim is speeding toward James Island with a speed of 24 m/s when he sees Betsy standing on shore at the base of a cliff (Figure 14-52). Jim sounds his 330-Hz horn.
(a) What frequency does Betsy hear?
(b) Jim can hear the echo of his horn reflected back to him by the cliff. Is the frequency of this echo greater than or equal to the frequency heard by Betsy? Explain.
(c) Calculate the frequency Jim hears in the echo from the cliff.