Question

The equation of a wave travelling in a string can be written as y = 3 cos$\pi$ (100 t – x) Its wavelength is

• A. 100 cm
• B. 2 cm
• C. 5 cm
• D. None of these

Answer 1

Answer: (B)

2 cm

Answer 2

y = A cos ($\omega t - kx) -$ standard equation

y = 3 cos (100 $\pi t - \pi x$) – given equation

So K = $\pi$ and $\lambda = \frac{2\pi}{k} =$2 cm