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Explain what the hydrogen spectrum is?

Answer
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Hint: The hydrogen spectrum is critical in demonstrating an atom's quantized electrical structure. When an electric discharge is conducted across a gaseous hydrogen molecule, the hydrogen atoms dissociate.

Complete answer:
When hydrogen gas is pushed through a discharge tube (a hydrogen discharge tube is a thin tube that contains hydrogen gas at a low pressure and has an electrode at either end) and a high potential (as high as 5000 volts) is placed across it, the tube emits a brilliant pink light. When permitted to travel through a prism, this light or radiation was seen to divide into its different hues. The measured spectrum represents just a fraction of the total hydrogen emission spectrum. The greatest portion of the spectrum is invisible to the human eye due to its infrared or ultraviolet wavelengths. What actually happened is that when an electric discharge was passed through a gaseous hydrogen molecule, the hydrogen atoms dissociated, resulting in the emission of electromagnetic radiation initiated by the energetically excited hydrogen atoms, referred to as the hydrogen emission spectrum or simply hydrogen spectrum, which consists of discrete frequency radiation. These radiation series have the names of the scientists who discovered them.
As a consequence, electromagnetic radiation is emitted, which is started by energetically excited hydrogen atoms. The hydrogen emission spectrum consists of discrete frequency radiation. These radiation series have the names of the scientists who discovered them.

Note:
Hydrogen spectrum wavelength
When a hydrogen atom absorbs a photon, it causes the electron to experience a transition to a higher energy level, for example, n = 1, n = 2. When a photon is emitted through a hydrogen atom, the electron undergoes a transition from a higher energy level to a lower, for example, n = 3, n = 2. During this transition from a higher level to a lower level, the transmission of light occurs. The quantized energy levels of the atoms, cause the spectrum to comprise wavelengths that reflect the differences in these energy levels. For example, the line at 656 nm corresponds to the transition n = 3 n = 2.