A) A sound wave undergoes diffraction behind obstacles.
B) The reflected sound wave at a fixed end interferes with the incident wave.
C) The longitudinal movement of air molecules produces pressure fluctuations.
D) The speed of the sound wave changes as it travels through a medium.
Correct Answer: C
Solution :
Pressure fluctuations occur as high pressure is created during compression and low pressure during rarefaction of air molecules in a sound wave.
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