A fan at a rock concert is 39.7m from the stage, and at this point the sound int

Question

A fan at a rock concert is 39.7m from the stage, and at this point the sound intensity level is 109.9dB . Sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate . Typically, the diameter of this membrane is about 8.4mm in humans

a) How much energy is transferred to her eardrums each second?

b) How fast would a 2mg 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).

Please enter your answer as a number (factor) without the units.

Explanation / Answer

there are multiple questions ....and we are not allowed to answer multiple questions....so i am answering only 2 parts of the question....raise another point for part c ) and d )

here i am assuming that the Distance from the speaker to the edge of the stage is 1 m.

Sound intensity level L in dB and sound intensity are related as:
L = 10?log??( I/I? )
with I? = 10?

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