Question: For which reason were quarks first introduced? To explain the existence of isotopes To describe nuclear emission and absorption spectra A. B. C. D.

For which reason were quarks first introduced? To explain the existence of

For which reason were quarks first introduced? To explain the existence of isotopes To describe nuclear emission and absorption spectra A. B. C. D. To account for patterns in properties of elementary particles To account for the missing energy and momentum in beta decay

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