A) 20 cm
B) 10 cm
C) 40cm
D) 30cm
Correct Answer: A
Solution :
Given equation is \[y=0.8\cos \left( \frac{\pi x}{20} \right)\,\sin \,\,200\pi t\] Comparing it with \[y=a\,\cos \frac{2\pi x}{\lambda }\sin \,\omega t,\]we get \[\frac{2\pi }{\lambda }=\frac{\pi }{2}\] \[\Rightarrow \] \[\lambda =40cm\] So, separation between two nodes \[=\frac{\lambda }{2}=20cm\]You need to login to perform this action.
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