A train of sound waves is propagated along a wide pipe and it is reflected from an open end. If the…

A train of sound waves is propagated along a wide pipe and it is reflected from an open end. If the amplitude of the waves is $0.002\text{ cm}$, the frequency is $1000\text{ Hz}$ and the wavelength is $40\text{ cm}$, the amplitude of vibration at a point $10\text{ cm}$ from open end inside the pipe will be
  1. zero
  2. $0.002\text{ cm}$
  3. 0.001
  4. $0.005\text{ cm}$

Solution

At $10\text{ cm}$ distance from open end or at distance $\frac{\lambda}{4}$ from the open end, there should be a node.

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