instruction:
This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
question:
Likewise, group theory helps predict the changes in physical properties that occur when a material undergoes a phase transition, for example, from a cubic to a tetrahedral crystalline form. An example is ferroelectric materials, where the change from a paraelectric to a ferroelectric state occurs at the Curie temperature and is related to a change from the high-symmetry paraelectric state to the lower symmetry ferroelectic state, accompanied by a so-called soft phonon mode, a vibrational lattice mode that goes to zero frequency at the transition.
answer:
What aids in predicting changes of physical traits?


question:
In the general election, against the advice of his advisors, Eisenhower insisted on campaigning in the South, refusing to surrender the region to the Democratic Party. The campaign strategy, dubbed "K1C2", was to focus on attacking the Truman and Roosevelt administrations on three issues: Korea, Communism and corruption. In an effort to accommodate the right, he stressed that the liberation of Eastern Europe should be by peaceful means only; he also distanced himself from his former boss President Truman.
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In what part of the country, previously neglected by Republican presidential candidates, did Eisenhower campaign?


question:
The strong force only acts directly upon elementary particles. However, a residual of the force is observed between hadrons (the best known example being the force that acts between nucleons in atomic nuclei) as the nuclear force. Here the strong force acts indirectly, transmitted as gluons, which form part of the virtual pi and rho mesons, which classically transmit the nuclear force (see this topic for more). The failure of many searches for free quarks has shown that the elementary particles affected are not directly observable. This phenomenon is called color confinement.
answer:

What does stong force act upon?