A piano tuner hears one beat every 2.8 s when trying to adjust two strings, one of which is sounding 350 Hz.

How far off in frequency is the other string?

The beat period is $\"\"$ .

$\"\"$

Find the beat frequency is $\"\"$ , where $\"\"$ is the beat period.

$\"\"$ \ \ By the definition of beat frequency, it is just the difference in the two frequencies.

$\"\"$ or $\"\"$

$\"\"$ and $\"\"$

The other frequency is either $\"\"$ and $\"\"$