Question

when we blow a glass bottle and a plastic bottle , we hear a shrill sound from a plastic bottle . why​

Answer 1

When you blow across the top of an open bottle the air inside it vibrates, producing sound waves we can hear. When we blow across an empty bottle there is more space for the air to vibrate in, so the air vibrates more slowly. We hear a lower pitch.

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Answer 2

The air column inside the glass bottle will help in producing this sound.

Explanation:

• A glass bottle will create a shriller sound than the plastic bottle.
• Because the glass is made up of compact material and the particles are very closely packed making it a dense material and the air column inside it will help in producing the shriller sound.
• Hence the air column inside the glass bottle will help in producing this sound.