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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?
Question by OpenStax is licensed under CC BY 4.0.
Final Answer

$4 \textrm{ Hz}$

Solution Video

OpenStax College Physics Solution, Chapter 16, Problem 57 (Problems & Exercises) (0:27)

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Video Transcript

This is College Physics Answers with Shaun Dychko. 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.