The device that is used for demonstrating the relationship between the frequency of the sound that is produced by the string when it is plucked and the tension, length, and mass per unit length of the string.
The sound is produced in the transverse standing wave in the string.
A spectroscope is a device that measures the spectrum (a band of colors, as seen in a rainbow) of light; it's basically a color x-ray that reveals the elements inside visible light.
The spectroscope analysis is used to observe the wide variety of light spectra (different colors) produced from various elements.
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