Question
Show graphically, the intensity variation of beats formation?
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Answer
When beats are formed by two sources having same amplitude but slightly different frequencies, the amplitude is given by $2\text{A}\cos2\pi\text{v}_\text{m}\text{t}$ where $\text{v}_\text{m}=\frac{\text{v}_1-\text{v}_2}{2}.$ Intensity $=4\text{A}^2\cos^2(2\pi\text{v}_\text{m}\text{t})$ and is shown graphically here.
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