Question

The electric field associated with an em wave in vacuum is given by.E = i 40 cos ( kz- 6 x 10⁸ t) where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector t is

(a) 2 m^-1

(b) 0.5 m^-1

(c) 6 m^-1

(d) 3 m^-1

Answer 1

Correct option  (a) 2 m^-1

Explanation:

Compare the given equation with