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In which of the following mediums, sound travels fastest?

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Galton's whistle is a whistle that can produce frequencies greater than

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Speed of sound in air is around

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Sounds of frequency less than $20 \mathrm{Hz}$ are called

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Audible range of frequency is

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Sound is produced in flute by

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Shrillness of a sound is determined by

Name the following:

number of oscillations made by a wave in a unit time

Name the following:

medium through which sound cannot travel