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JAMB Physics 2020 Paper

Question : 36

Total: 38

In which of the following diagrams is the length of the tube equal to one wavelength?

Solution:

Concept:

One wavelength is equivalent to two half-wavelength loops or two half-wave segments in a standing wave in a tube.

Explanation:

For a tube supporting a standing wave, each loop is

\frac{\lambda}{2}

For the tube length to be one wavelength:

L = \lambda = 2\left(\frac{\lambda}{2}\right)

So the tube must contain exactly two half-wavelength loops.

In the given options, this is the diagram labelled b.

Answer:

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