An audio signal modeled as $x**sin(Kt-\frac{}{2})$ is rendered as sound. Which of the following statements is correct?

$K$ is expressed in seconds

An increase of $K$ will will raise the perceived intensity

Raising $x$ will result in higher sound pitch

An increase of $K$ will reduce the perceived audio's time delay

Reducing $K$ will result in a lower$-$pitched sound