Question

A car has two horns, one emitting a frequency of 199 Hz and the other emitting a frequency of 203 Hz. What beat frequency do they produce?

Final Answer

$4 \textrm{ Hz}$

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This is College Physics Answers with Shaun Dyhcko.
The beat frequency of two sounds being produced concurrently is the absolute value of the difference between the two frequencies. So we have a car horn producing a frequency of 199 Hertz and another horn producing a frequency of 203 Hertz. The difference between them is negative four and the absolute value of that is four Hertz. So the beat frequency is four Hertz.