The given magnetic field component is:
$H = 25 \sin(2 \times 10^8 t + 6x) a_y$ mA/m
The general form of a sinusoidal wave is:
$H = H_0 \sin(\omega t + kx)$
Here, $\omega = 2 \times 10^8$ rad/s and $k = 6$ rad/m.
Since the sign of $kx$ is positive, the wave is
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