Why does the sound from a glass kept before water tank become shriller

1.	Why does the sound from a glass kept before water tank become shriller?
Answer» ANSWER: The sound GRADUALLY gets QUITTER and dies out as the amplitude of the vibrations diminishes due to energy being carried away by the sound waves. ... If you can match the pitch of your voice to the RESONANT FREQUENCY of the glass the vibrating air will start the glass vibrating too.

Why does the sound from a glass kept before water tank become shriller?

Answer»

The sound GRADUALLY gets QUITTER and dies out as the amplitude of the vibrations diminishes due to energy being carried away by the sound waves. ... If you can match the pitch of your voice to the RESONANT FREQUENCY of the glass the vibrating air will start the glass vibrating too.

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Why does the sound from a glass kept before water tank become shriller?​

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Why does the sound from a glass kept before water tank become shriller?