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.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What term describes the vibrational lattice mode that turns to 0 frequency at the change?
Ah, so.. soft phonon mode

Qado or lunch is often elaborate. Varieties of bariis (rice), the most popular probably being basmati, usually serve as the main dish. Spices like cumin, cardamom, cloves, cinnamon, and garden sage are used to aromatize these different rice delicacies. Somalis eat dinner as late as 9 pm. During Ramadan, supper is often served after Tarawih prayers; sometimes as late as 11 pm.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What is bariis in English?
Ah, so.. rice

The era of planning in Himachal Pradesh started 1948 along with the rest of India. The first five-year plan allocated ₹ 52.7 million to Himachal. More than 50% of this expenditure was incurred on road construction since it was felt that without proper transport facilities, the process of planning and development could not be carried to the people, who mostly lived an isolated existence in far away areas. Himachal now ranks fourth in respect of per capita income among the states of the Indian Union.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When did the era of planning start in Himachal Pradesh?
Ah, so..
1948