I. Your grandmother bought two tickets to see the Foo Fighters and asked you to go. The seats are about 20 meters from the stage and you measure the sound intensity level to be 105. dB. a. How much energy is hitting your eardrum (1-43. mm) each second? b. While grandma is rocking out, you find it too loud and so run away from the stage at 9.0 m/sec (not quite Bolt speed but pretty darn fast). How long do you have to run to get to the place where the decibel level is 85 dB? Assume the concert is outdoors. c. David Grohl is thrashing his guitar, to the cheers of the audience. He lingers on a high B-flat (f=466.16 Hz). As you are running, what frequency do you hear the guitar?