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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsDe Broglie & Matter WavesMedium2 minQB

PhysicsMediumsingle choice

Helium $_{2}^{4} He$ becomes a superfluid at temperature T < 2.18 K. A superfluid flows with no viscosity. This behaviour can only be explained using quantum physics and it can only happen if the de Broglie wavelength of a helium atom of mass m is comparable to the interatomic spacing of the liquid. The correct expression for the de Broglie wavelength $λ$ could be

Options:

Answer:

Solution:

Only $λ = \frac{h}{2 m K T} = \frac{h}{p}$ with $p = 2 m \cdot K T$ has the dimensions of length; the other options are dimensionally wrong.

Subject:PhysicsTopic:Modern PhysicsSubtopic:De Broglie & Matter Waves

⏱ 2mℹ️ Source: QB

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