When a beam of visible white light that passes through a
Chapter , Problem 16(choose chapter or problem)
When a beam of visible white light that passes through a gas of atomic hydrogen at room temperature is viewed with a spectroscope, dark lines are observed at the wavelengths of the hydrogen atom emission series. The atoms that participate in the resonance absorption then emit light of same wavelength as they return to the ground state. Explain why the observed spectrum nevertheless exhibits pronounced dark lines.
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