\(\Delta n = {n_1} - {n_2} = v\,\left[ {\frac{1}{{0.05}} - \frac{1}{{0.51}}} \right] = 12\)
==> \(v = \frac{{12 \times 0.51 \times 0.50}}{{0.01}} = 306\,m/s\)
${y_1} = 0.05\,\cos \,\left( {0.50\,\pi x - 100\,\pi t} \right)$
${y_2} = 0.05\,\cos \,\left( {0.46\,\pi x - 92\,\pi t} \right)$
તો તેનો વેગ $m/s$માં કેટલો મળે?