The eardrum is a membrane located in the middle ear that vibrates when sound waves hit it$.$ Assume an eardrum has an area of $5\mathrm{.}02105$ m$2.$

$($a$)$

Calculate the average sound power $($in W$)$ incident on an eardrum at the threshold of pain, which corresponds to an intensity of $1\mathrm{.}00$ W$/$m$2.$

W

$($b$)$

How much energy $($in J$)$ is transferred to the eardrum exposed to this sound for $2\mathrm{.}75$ min?

J