alleryTwo waves with frequencies f1 and f2 are superimposed. What formula gives the beat frequency f_B?
Af_B = f1 + f2
Bf_B = |f1 - f2|
Cf_B = (f1 + f2) / 2
Df_B = f1 x f2
Answer & Solution
Correct answer: B. f_B = |f1 - f2|
1. The beat frequency equals the absolute difference between the two original frequencies.
2. In formula form, this is f_B = |f1 - f2|, matching option B.
3. Option A instead adds the frequencies together, which is not how beat frequency is defined.
4. Options C and D describe an average and a product, neither of which is the beat frequency formula.
_Source: OpenStax Physics (CC BY 4.0), Ch 14 "Sound", section Resonance and Beats_
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