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For humans, the visible spectrum is the portion of the electromagnetic spectrum that human eyes can see. It is associated with wavelengths from about $$380$$ to $$740$$ nanometers (nm), where a nanometer is one billionth of a meter.

The Human Visible Spectrum

A researcher is using a specialized light source that can be tuned to emit a single wavelength of light. If the researcher sets the device to emit light at a wavelength of 680 nanometers (nm), which of the following experiences would a human participant most likely report?

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