Peoples Physics Concepts

11.3. Beat Frequencies http://www.ck12.org

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1. At the Sunday drum circle in Golden Gate Park, an Indian princess is striking her drum at a frequency of 2
   Hz. You would like to hit your drum at another frequency, so that the sound of your drum and the sound of
   her drum “beat” together at a frequency of 0.1 Hz. What frequencies could you choose?


2. You and your friend play the same note. Your friend’s instrument is in tune and is playing a note at 256 Hz,
   but you are slightly out of tune and are playing a note at 258 Hz. What is the beat frequency?

Answers

1. 1.9 Hz or 2.1 Hz


2. 2 Hz