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(A) The standard equation of a stationary wave is $y = A \cos \left( \frac{2\pi x}{\lambda} \right) \sin (\omega t)$.Comparing the given equation $y =

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$20$

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(A) The standard equation of a stationary wave is $y = A \cos \left( \frac{2\pi x}{\lambda} ight) \sin (\omega t)$.Comparing the given equation $y = 0.8 \cos \left( \frac{\pi x}{20} ight) \sin (200 \pi t)$ with the standard form:$\frac{2\pi}{\lambda} = \frac{\pi}{20}$$\frac{2}{\lambda} = \frac{1}{20}$$\lambda = 40 	ext{ cm}$.The distance between two consecutive nodes is given by $\frac{\lambda}{2}$.Distance $= \frac{40}{2} = 20 	ext{ cm}$.

The equation of a stationary wave is given by $y = 0.8 \cos \left( \frac{\pi x}{20} \right) \sin (200 \pi t) \text{ cm}$. What is the distance between two consecutive nodes in cm?

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