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Detection of Hydrogen Hydrogen is prevalent in the universe. Life in the universe is ultimately based on hydrogen. According to Wien's law, the wavelength (lambda) corresponding to the maximum light intensity emitted from a blackbody at temperature T is given by lambdaT=2.9xx10^(-3) mK. Calculate the surface temperature of a star whose blackbody radiation has a peak intensity corresponding to then n=1 rarr n=2 excitation of hydrogen. The ground state hydrogen is split into hyperfine levels due to the interaction between the magnetic moment of the proton and that of the electron. In 1951, Purcell discovered a spectral line at 1420 MHz due to the hyperfine transition of hydrogen in interstellar space. |
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