Sound waves generated in a classroom must <em><u>diffract</u></em> through an open doorway in order to propagate into the hallway.
<h3><u>Explanation;</u></h3>
<em><u>Sound waves are a type of mechanical waves that requires a material medium for transmission,</u></em> they are longitudinal wave with all the properties of other waves.
<em><u>Diffraction is one of the property of waves that involves a change in direction of waves as they pass through an opening or around a barrier in their path. </u></em><u><em>Sound wave diffract around corners or through the door openings, allowing people to hear others speaking to us from rooms that are adjacent. </em></u>
