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Sagot :
Due to drop in pressure, electricity flows and gas glows. Because there are different protons and different electrons so they emit different bands of light.
When electricity is applied to the gas tube, there is a drop in pressure and eventually it reaches to a level where current starts flowing and the gas starts glowing.
Different elements give different bands of light because they have different numbers of protons an different arrangements of electrons, so they need different amount of energy to pull out from their orbital. Different amount of energy emits different wavelength, and different wavelengths rays are visible to us different color.
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