Light falling on metallic surface of work function 2eV is given by \[B\text{ }=\text{ }100\text{ }\left[ sin\text{ }\left( 5\text{ }\times \text{ }{{10}^{15}} \right)\text{ }t\text{ }+\text{ }cos\text{ }\left( 8\text{ }\times \text{ }{{10}^{15}} \right)t \right]\]Then maximum kinetic energy of the photoelectrons is-