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A snapshot is taken of a periodic wave t...

A snapshot is taken of a periodic wave travelling on a string as shown below. What is the amplitude and wavelength of the wave?

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The highest of the wave is seen, from the snapshot, to be 2.0 cm. The amplitude is only one half of this, so a = 1.0 cm.
The wave is seen to have four wavelengths spread over a distance of 0.70 m so the wavelength
`lambda = (0.70m)/(4) = 0.175m`
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