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Unformatted text preview: 43. Since the beat frequency equals the diﬀerence between the frequencies of the two tuning forks, the
frequency of the ﬁrst fork is either 381 Hz or 387 Hz. When mass is added to this fork its frequency
decreases (recall, for example, that the frequency of a mass-spring oscillator is proportional to 1/ m).
Since the beat frequency also decreases the frequency of the ﬁrst fork must be greater than the frequency
of the second. It must be 387 Hz. ...
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