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A piano tuner listens to the 'G' Key and a standard 392 Hz tuning fork simultaneously....

A piano tuner listens to the 'G' Key and a standard 392 Hz tuning fork simultaneously. She hears a beat frequency of 9 Hz.

a) What are the two possibilities for this true frequency of the piano note?

Upper    and lower   

b) As she tightens the piano wire, the beat frequency changes to 8 Hz and 7 Hz. Which answer from part (a) was the true original frequency of the piano note.

Higer Frequency

Lower Frequency
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