Afan at a rock concert is 50.0 m from the stage, and at this point the sound intensity level is 114 db. sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate . typically, the diameter of this membrane is about 8.40 mm in humans.
a. how much energy is transferred to her eardrums each second ? b. how fast would a 2.00 mg mosquito have to fly to have this much kinetic energy? c. how fast a typical 2.0 mg mosquito would have to fly (in mm/s) to have an amount of energy delivered to the eardrum each second when someone whispers (20 db) a secret in your ear? d. compare the mosquito's speeds found in parts (b) and (c).

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0