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प्रश्न
In a laboratory experiment on emission from atomic hydrogen in a discharge tube, only a small number of lines are observed whereas a large number of lines are present in the hydrogen spectrum of a star. This is because in a laboratory
विकल्प
the amount of hydrogen taken is much smaller than that present in the star
the temperature of hydrogen is much smaller than that of the star
the pressure of hydrogen is much smaller than that of the star
the gravitational pull is much smaller than that in the star
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उत्तर
the temperature of hydrogen is much smaller than that of the star
The number of lines of the hydrogen spectrum depends on the excitation of the hydrogen atom. This is dependent on the heat energy absorbed by the hydrogen atoms. More the temperature of the hydrogen sample, more is the heat energy. The temperature of hydrogen at the star is much more than that can be produced in the laboratory. Hence, less number of lines are observed in the hydrogen spectrum in the laboratory than that in a star.
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संबंधित प्रश्न
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(a) isobars
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`1/lambda = "R"(1/2^2 - 1/"n"^2)`, where n = 3, 4, 5,....
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Hydrogen spectrum consists of discrete bright lines in a dark background and it is specifically known as hydrogen emission spectrum. There is one more type of hydrogen spectrum that exists where we get dark lines on the bright background, it is known as absorption spectrum. Balmer found an empirical formula by the observation of a small part of this spectrum and it is represented by
`1/lambda = "R"(1/2^2 - 1/"n"^2)`, where n = 3, 4, 5,....
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