In an electromagnetic wave propagating along +x-axis electric field vector is Ey=4x103 Cos (3x108t-1.5x) v/m. what is (i) the frequency of em wave (ii) amplitude of magnetic field

Given, E_y= 4 x10³ Cos (3x10⁸t -1.5 x) V/m

(i) frequency, v =?/2?

           ?        =3 x10⁸ rad/sec

v    =3x10⁸/2?

     =4.77x10⁷ Hz

(ii)amplitude of magnetic field B_z = E_y/c

                                              =4x 10³ /3 x 10⁸

                                             1.33X 10^-5T