$1\mathrm{.}1$ A deep$-$water wave has a wavelength of $39$ m $,$ assuming sea water density as

$1025k\frac{g}{m^3}$ and acceleration due to gravity as $9\mathrm{.}81\frac{m}{s^2}$ estimate:

$($a$)$ the period, and

$($b$)$ the phase velocity

$1\mathrm{.}2$ For the deep$-$water wave in $(1\mathrm{.}1),$ calculate the power if the amplitude is $1\mathrm{.}5$ m $.(3)$

$1\mathrm{.}3$ Identify two negative environmental impacts of wave power devices and suggest

steps to mitigate them.