you are heading toward an island in a speedboat and you see your friend standing on the shore, at the base of a cliff. you sound the boat's horn to alert your friend of your arrival. the sound from the boat hits the cliff behind your friend and returns to you as an echo. part description answer save status a. if the horn has a rest frequency of f0, what frequency does your friend hear? lower than f0 equal to f0 higher than f0 click here to check your answer 6.25 pts.100%