I think is is A. welding torches
The answer is B. A guitar generally produces sound waves that propagate when the strings are strummed. The strings are displaced through the vibrations caused by contact of the hand and the guitar. You will also notice the vibrations by looking closely to the string. Wave particles continuously collide with each other to make a sustaining or prolonging sound.
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I have no idea I know it’s gonna be a number
The change is that the water will freeze to 0 or minus I don’t know as I’m not to sure
