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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsDe Broglie & Matter WavesEasy2 minPYQ_2020

PhysicsEasysingle choice

The wavelength of the de-Broglie wave associated with a thermal neutron of mass $m$ at absolute temperature $T$ is given by (Here, $k$ is the Boltzmann constant)

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Answer:

Solution:

KE of thermal neutron, $\frac{1}{2} m v^{2} = \frac{3}{2} k T$

or $m v = \sqrt{3 k m T}$ ; So, $λ = \frac{h}{p} = \frac{h}{\sqrt{3 k m T}}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:De Broglie & Matter Waves

⏱ 2mℹ️ Source: PYQ_2020

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