A) 120 cm
B) 50 cm
C) 2 cm
D) 5 cm
Correct Answer: C
Solution :
The standard equation of a wave of amplitude a is given by \[y=a\cos (\omega t-kx)\] ...(i) where,\[\omega \] is angular velocity, k the wave number and t the time. Given equation is \[y=20\cos \pi (50t-x)\] ... (ii) Comparing Eq. (i) with Eq. (ii), we get \[k=\frac{2\pi }{\lambda }=\pi \] \[\Rightarrow \] \[\lambda =2cm\]
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