A digital spectrometer is used to measure the wavelengths of an emission spectrum of a gas. At the peak value for one of the wavelengths is found to be 489 nm. The width of the peak at half its maximum value is 1.5 nm and the width at its base is 3 nm. What is the uncertainty in the measured wavelength?

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Nature of light

Light is transverse and electromagnetic radiation that exhibits the properties of a wave as well as a particle. For this reason, light is said to have a “dual nature.”