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The number of correct statements are 1) ...

The number of correct statements are 1) Maximum intensity of sound(waxing) is produced in the beats when constructive interference takes place II) Minimum intensity of sound(waning) is produced in the beats when destructive interference takes place III) Beats phenomenon used to detect the presence of dangerous gases in mines IV) Beats phenomenon used to detect unknown frequency of a tuning fork with the help of a standard tuning fork

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Explain how the phenomenon of beats may be used for finding the unknown frequency of a tuning fork.

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