A bungee-jumper jumps off of a tall bridge and blows a whistle as she falls toward the ground below, where her friends are watching. Her friends observe that the sound of the whistle is shifted toward a higher frequency due to the Doppler effect. The sound of the bungee-jumper's whistle reflects off of the ground and bounces back to her. Which of the following best describes the sound of the echo as heard by the bungee-jumper?

Question

anonymous · Answer

A.	The frequency of the echo heard by the bungee-jumper is higher than the sound heard by her friends.
	B.	The frequency of the echo heard by the bungee-jumper is the same as the sound heard by her friends.
	C.	The frequency of the echo heard by the bungee-jumper is lower than the sound heard by her friends, but higher than the actual sound of the whistle.
	D.	The frequency of the echo heard by the bungee-jumper is the same as the actual sound of the whistle.