The correct answer is: "vibrate".
To find the correct word to complete the sentence, we need to know more about the sound wave.
What is sound wave?
- Sound wave is a longitudinal wave i.e. the particles vibrate along the direction of propagation of wave.
- It requires a material medium to travel i.e. it can not travel in vacuum.
How does sound wave produce?
- Sound wave is produced due to variation of pressure in a medium.
- The high pressure region is compression region and low pressure region is rarefaction region.
- In case of an object, these pressure variations are produced by its vibration in a medium.
Thus, we can conclude that sounds are made when objects vibrate in air.
Learn more about sound wave here:
https://brainly.com/question/1199084
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