The sound beam is _______ if the spike line is curved.

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Multiple Choice

The sound beam is _______ if the spike line is curved.

Explanation:
A curved spike line shows the wavefronts are converging toward a focal point, so the beam is focused. When beams are focused, they narrow at the focal region and have higher intensity there, then spread again beyond the focus. If the spike line were straight, the rays would travel in parallel, indicating an unfocused beam. The curvature is the visual cue that focusing is taking place, which means the beam is focused.

A curved spike line shows the wavefronts are converging toward a focal point, so the beam is focused. When beams are focused, they narrow at the focal region and have higher intensity there, then spread again beyond the focus. If the spike line were straight, the rays would travel in parallel, indicating an unfocused beam. The curvature is the visual cue that focusing is taking place, which means the beam is focused.

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