#RFB-11000642Reading: Fill in the BlanksAcademic,CoreMedium

Thunder

Official Question Material
Prep: Varies

Thunder is the sound caused by a lightning discharge. Lightning heats the air in its path and [blank] a large over-pressure of the air within its channel. The channel expands supersonically into the surrounding air as a shock wave and creates an [blank] signal that is heard as thunder. The thunder heard after a flash to the ground is actually produced by the return stroke that follows the path [blank] by the initial stroke.

Sample Answer & Audio Transcript

Thunder is the sound caused by a lightning discharge. Lightning heats the air in its path and causes a large over-pressure of the air within its channel. The channel expands supersonically into the surrounding air as a shock wave and creates an acoustic signal that is heard as thunder. The thunder heard after a flash to the ground is actually produced by the return stroke that follows the path forged by the initial stroke.
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