Draw graphs of beats produced by two harmonic waves of frequency $11 \ Hz$ and $9 \ Hz$.
(N/A) The time-displacement graphs of two waves of frequency $11 \ Hz$ and $9 \ Hz$ are shown in figure $(a)$ and $(b)$.
The result of their superposition is shown in figure $(c)$.
Beats are the periodic variation in intensity at a given point due to the superposition of two sound waves of slightly different frequencies. The beat frequency is given by $f_{beat} = |f_1 - f_2| = |11 \ Hz - 9 \ Hz| = 2 \ Hz$. This means there are $2$ beats per second.
The result of their superposition is shown in figure $(c)$.
Beats are the periodic variation in intensity at a given point due to the superposition of two sound waves of slightly different frequencies. The beat frequency is given by $f_{beat} = |f_1 - f_2| = |11 \ Hz - 9 \ Hz| = 2 \ Hz$. This means there are $2$ beats per second.
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