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Two sirens sound together, one at 512 Hz and one at 515 Hz…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Two sirens sound together, one at Hz and one at Hz. Find the beat frequency, and the number of beats you hear in s.
Need a reminder? The key ideaShow
Waves add point by point: y = y1 + y2. Two frequencies close together give beats at a second. A string fixed at both ends has and nodes half a wavelength apart. A square wave is a sum of odd harmonics .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The beat frequency. Hz.
Step 2. The beats. beats.
Answer: Hz, and beats in s.
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