Integrated Concepts

If electric and magnetic field strengths vary sinusoidally in time, being zero at $t = 0$, then $E = E_{0} \text{sin} 2π \text{ft}$ and $B = B_{0} \text{sin} 2π \text{ft}$. Let $f = 1 . \text{00 GHz}$ here. (a) When are the field strengths first zero? (b) When do they reach their most negative value? (c) How much time is needed for them to complete one cycle?