describing several levels of processes, increasing in energy, and corresponding sets of particles, generally decreasing in size
putting forth an argument concerning energy levels and then conceding that several qualifications of that argument are necessary
making several successive refinements of a definition of elementarity on the basis of several groups of experimental results
24. According to the passage, which of the following can be found in the atomic realm?
More than one level of energy exchange
Exactly one elementary particle
Exactly three kinds of atomic structures
Three levels on the quantum ladder
No particles smaller than atoms
25. According to the author, gluons are not
considered to be detectable
produced in nuclear reactions
encountered in subnuclear energy exchanges
related to the strong force
found to be conditionally elementary
26. At a higher energy level than the subnuclear level described, if such a higher level exists, it can be expected on the basis of the information in the passage that there would probably be
excited nucleons
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