A) 5 cm
B) 2 cm
C) 100 cm
D) 3 cm
Correct Answer: B
Solution :
Key Idea: Comparing the equation of wave moving on a string with standard (general) wave equation. The given wave equation is \[y=3\cos \pi \,(100\,t-x)\] ... (i) The general equation of wave is \[y=a\cos \,(\omega \,t-k\,x)\] ... (ii) Comparing the two equations, we obtain \[k=\pi \] or \[\frac{2\pi }{\lambda }=\pi \] or \[\lambda =2\,cm\]You need to login to perform this action.
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