As the broadcaster speak the sound wave being produced by?

Vocal Cords Vibrate: Air from the lungs passes through the vocal cords.
Sound Waves Form: Vibrations create sound waves.
Propagation: Sound waves travel through the air to the listener.

Supplemental Knowledge:

Sound waves are a type of mechanical wave that travel through a medium (such as air, water, or solids) due to the vibration of particles in that medium. When a broadcaster speaks, several processes occur to produce sound waves:

Vocal Cord Vibration:

The broadcaster's vocal cords vibrate as air from the lungs passes through them. This vibration creates pressure variations in the surrounding air.
Compression and Rarefaction:

These pressure variations result in regions of compression (where air molecules are pushed together) and rarefaction (where air molecules are spread apart). This alternating pattern forms a longitudinal wave.

Propagation Through Medium:

The sound wave travels through the medium by transferring energy from one particle to the next. In air, this means that molecules bump into each other, passing along the energy of the sound wave.

Theory in Practice：

Imagine you’re at a concert where a singer is performing on stage. As they sing into the microphone, their vocal cords vibrate, creating sound waves that travel through the air to reach your ears. These waves cause your eardrums to vibrate in response, allowing you to hear their voice.

In another example, think about how you can hear someone speaking even if they are not directly facing you. This is because sound waves radiate outwards from their source in all directions, bouncing off surfaces and traveling around obstacles until they reach your ears.

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