How many head-on elastic collisions must a neutron have with deuterium nuclei to reduce it energy from `6.561 MeV` to `1 keV`?

How many head-on, eleastic coillisions must a neutron have with deuterium nucleus to reduce its energy from 1 MeV to 0.025 eV .

How many head-on, eleastic coillisions must a neutron have with deuterium nucleus to reduce its energy from 1 MeV to 0.025 eV .

In a nuclear reactor, the neutrons produced in fission reaction have high kinetic energy of the order of few MeV. Whereas the U^(235) nucleus fissions only iwht a slow neutron. In a reactor heavy water (D_(2)O) is used to slow down the neutrons. A neutron hiting a deuterium nucleus slows down quickly. Calculate now many head on, elastic collisions must a neutron have with deuterium nuclei to reduce does not lose energy by any other way apart from collisions with deuterium. [Take "log"_(10)2=0.301 and "log"_(10)3=0.477 ]

A neutron makes a head-on elastic collision with a stationary deuteron. The fraction energy loss of the neutron in the collision is

A neutron makes a head-on elastic collision with a stationary deuteron. The fraction energy loss of the neutron in the collision is

A neutron makes is a head - on elastic collision with a stationary deuteron The fraction energy loss of the neutron in the collision is