Why does the sound from a glass kept before water tank become shriller?
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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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This is due to the fact that the water volume inside the glass makes it much heavier and therefore, it is more difficult for the glass walls to vibrate. That means that the sound wave generated by the vibrations is much slower or has a lower frequency.
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