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A sound wave is travelling in a medium....

A sound wave is travelling in a medium.If equation of displacement wave in the medium is given by `y` = `2cos`( `2``pi``x` `-``100``pi``t` `+` `pi/2` ) then equation of pressure waves will be (B `rarr` Bulk modulus of medium)
(А) `P``=` `4B``pi` `sin`(`2``pi``x``-` `100``pi``t`)
(В) `P``=` `4B``pi` `sin`(`2``pi``x``+` `100``pi``t`)
(C) `P``=` `4B``pi` `cos`(`2``pi``x``-` `100``pi``t`)
(D) `P``=` `4B``pi` `cos`(`2``pi``x``+` `100``pi``t`)

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