Lise Meitner Explains a Split Nucleus
Written by Studio AM.
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Lise Meitner built a career in physics when women faced formal and informal barriers in European universities. In Berlin, she collaborated for decades with chemist Otto Hahn on radioactivity and nuclear research. Their skills were different but complementary: chemical experiments identified substances, while physical theory helped explain what happened inside atoms.
In 1938, Nazi persecution forced Meitner, who had Jewish ancestry, to flee Germany. Hahn and Fritz Strassmann continued experiments in Berlin and found barium after bombarding uranium with neutrons. The result was surprising because barium is much lighter than uranium. Hahn wrote to Meitner about the evidence.
While in Sweden, Meitner and her nephew, physicist Otto Frisch, interpreted the result as a uranium nucleus splitting. They used a nuclear model and the relation between mass and energy to explain the large energy release. Frisch soon described the process experimentally and named it nuclear fission.
The discovery did not belong to one isolated moment. It depended on experimental results, theoretical interpretation, correspondence across borders, and earlier shared work. Credit was not distributed equally: Hahn alone received the 1944 Nobel Prize in Chemistry. Meitner's story shows why the history of science must examine both evidence and the conditions governing who can work, escape danger, communicate, and receive recognition.
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Questions
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Question 1 of 4
What is the main idea of the passage?
The answer is B: Lise Meitner's interpretation was essential to explaining nuclear fission, within a collaboration shaped by exile, unequal barriers, and disputed recognition.
The passage links experimental and theoretical contributions while placing them within persecution and later credit.
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Question 2 of 4
Why did finding barium surprise the researchers?
The answer is C: Barium was much lighter than uranium, suggesting a change more drastic than expected.
The second paragraph gives the mass contrast as the reason the chemical result demanded explanation.
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Question 3 of 4
What does “complementary” mean in the first paragraph?
The answer is D: different in ways that work usefully together
Chemistry identifies the products while physics explains the nuclear process, so the approaches support each other.
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Question 4 of 4
Who interpreted the result with Meitner?
The answer is A: Otto Frisch
The third paragraph names Meitner's nephew Otto Frisch as her partner in the interpretation.
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