The spectrum of an oxygen lamp looks different because each atom has a unique set of electron orbits.
In chemistry, the word spectrum shows different colors of light after passing through a piece of the prism.
It also indicates the intensity of radiations having different wavelengths and energy.
A simple spectrum looks like a rainbow displaying various colors and intensities of light such as visible light.
Similarly, when an electron jumps from a higher state to a ground state it also emits a spectrum in the form of electromagnetic radiation.
Fluorescence and absorption are examples of the spectrum.
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