Given the waveform in Figure 24.5(d), if

$T = 3.0 \times 10^{-9} \textrm{ s}$ and

$E = 5.0 \times 10^5 \textrm{ N/C}$, which of the following is the correct equation for the wave at the antenna?

- $\left( 5.0 \times 10^5 \textrm{ N/C} \right) \sin\left( 2\pi(3.0 \times 10^{-9} \textrm{ s})t \right)$
- $\left( 5.0 \times 10^5 \textrm{ N/C} \right) \sin \left( \dfrac{2\pi t}{3.0 \times 10^{-9} \textrm{ s}} \right)$
- $\left( 5.0 \times 10^5 \textrm{ N/C} \right) \cos\left( 2\pi(3.0 \times 10^{-9} \textrm{ s})t \right)$
- $\left( 5.0 \times 10^5 \textrm{ N/C} \right) \cos \left( \dfrac{2\pi t}{3.0 \times 10^{-9} \textrm{ s}} \right)$