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34. a-point transition in liquid helium during 34. bose-einstein condensation occurs at (a) 3.91 k (c) 0.291 k (b) 2.91 k (d) 2.19 k
34. A-point transition in liquid helium during 34. Bose-Einstein condensation occurs at (A) 3.91 K (C) 0.291 K (B) 2.91 K (D) 2.19 K
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Superfluid helium-4 is the superfluid form of Helium4 and an isotope of the element helium. A superfluid is a state of matter in which matter behaves like a fluid with zero viscosity. The substance, which looks like a normal liquid, flows without friction past any surface, which allows it to continue to circulate over obstructions and through pores in containers which hold it, subject only to its own inertia. The formation of the superfluid is known to be related to the formation of a bose-Einstein Condensate. This is made obvious by the fact that superfluidity occurs in liquid Helium-4 at far higher temperatures than it does in He-3 Each atom of He-4 is a boson particle, by virtue of its zero spin. He-3, however, is a fermion particle, which can form bosons only by pairing with itself at much lower temperatures, in a process similar to the electron pairing in superconductivity. And Lambda point is the temperature at which this transformation occurs. and this temperature is less than 2.71K. so option(D) is correct.