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When two sound sources of the same amplitude but bf slightly different frequencies \( v_{1} \) and \( v_{2} \) are
\( \mathrm{P} \) sounded simultaneously, the sound one hears has a frequency equal to
(a) \( \left|v_{1}-v_{2}\right| \)
(b) \( \left[\frac{v_{1}+v_{2}}{2}\right] \)
(c) \( \sqrt{v_{1} v_{2}} \)
(d) \( \left[v_{1}+v_{2}\right] \)
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