Suppose that electric feild part of an EM wave in vacuum is E(y)=0.5cos[2(pi)X10(power 8)(t-(x/c})], E(x)=0 and E9z)=0. All quantities have SI unit (i)What is the direction of propagation? (ii)What is the frequency? (iii) What is the amplitude of the magnetic feild part of the wave? Write the equation of associated magnetic feild.