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Physics
Classical Physics
Electromagnetism
Beats: frequency of resulting wave vs. beats frequency
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[QUOTE="Soren4, post: 5508651, member: 589474"] The [B]beats frequency [/B]heard from the interference of two sound waves with frequencies ##f_1## and ##f_2## is $$\nu=|f_1-f_2|$$ Nevertheless [B]the frequency of the resulting wave[/B] is not ##\nu## but the mean value of the two frequencies $$f_{resulting}=\frac{f_1+f_2}{2}$$ As far as I understood ##\nu## is the frequency at which the maxima of intensity are heard, while ##f_{resulting}## is indeed the frequency of the resulting wave. In particular I can notice that ##f_{resulting} > \nu## always. The distincion between the two is clear in theory, but in practice I still have doubts. Suppose to have an instrument that can measure sound waves iff the frequency is, say, bigger than ##f_{min}## and lower than ##f_{max}##. Now suppose that two waves interefere in a way such that ##f_{resulting} > f_{min}## but ##\nu <f_{min}##, or, in a way such that ##\nu < f_{max}## but ##f_{resulting} > f_{max}##. What does the instrument measure in these cases? Which of the two frequencies "determine" the upper of lower limits for the frequency that can be measured by such instrument? [/QUOTE]
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Physics
Classical Physics
Electromagnetism
Beats: frequency of resulting wave vs. beats frequency
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