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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

A neutron is moving with velocity $u .$ It collides head-on and elastically with an atom of mass number $A$ . If the initial kinetic energy of the neutron is $E$ , then how much kinetic energy will be retained by the neutron after reflection?

Options:

Answer:

Solution:

The fraction of total retained by nucleus

${(\frac{Δ k}{k})}_{retained} = {(\frac{m_{2} - m_{1}}{m_{1} + m_{2}})}^{2} = {(\frac{A - 1}{A + 1})}^{2}$

Kinetic energy retained by neutron after collision is ${(\frac{A - 1}{A + 1})}^{2} E .$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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