starting from rest, your friend dives from a high cliff into a deep lake below, yelling in excitement at the thrill of free-fall on her way down. you watch her as you stand on the lake shore immediately below, and at a certain instant your keen hearing recognizes that the usual frequency of her yell, which is 927 hz , is shifted by 52.5 hz . is this shift an increase or a decrease in the frequency? increase cannot tell from the information provided decrease how long ???? has your friend been in the air when she emits the yell whose frequency shift you hear? use ????
