NEET Physics Waves Questions Solved

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When a wave undergoes a reflection at a denser medium then it's crest reflectedas trough and vice versa.

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$$\begin{gathered} \mathrm{\omega }=\frac{2\mathrm{\pi }}{0.01}\Rightarrow 2\mathrm{\pi f}=\frac{2\mathrm{\pi }}{0.01}\Rightarrow \mathrm{f}=100\mathrm{Hz} \\ \mathrm{Frequency} \mathrm{of} \mathrm{oscillations}=100\mathrm{Hz} \\ \mathrm{Particle} \mathrm{will} \mathrm{reach} \mathrm{at} \mathrm{maximum} \mathrm{displacement} \mathrm{two} \mathrm{time} \mathrm{in} \mathrm{one} \mathrm{oscillation}. \\ \mathrm{Frequency} \mathrm{of} \mathrm{reaching} \mathrm{maximum} \mathrm{displacement}=2\times 100=200\mathrm{Hz} \end{gathered}$$