smusisca53
05.12.2019 •
Physics
Suppose that a fission neutron, emitted with an energy of 2 mev, slows down to an
energy of 1 ev as the result of successive collisions in a moderator. if, on the average,
the neutron gains in lethargy the amount \xi in each collision, how many collisions are
required if the moderator is
(a) hydrogen,
(b) graphite?
hint: you need to calculate the change in lethargy from 2 mev to 1 ev. then, calculate (or look up in a table) the average change in lethargy per collision to obtain the total number of collisions
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Ответ:
Explanation:
Sri Lanka is hotter than Nepal because Sri Lanka is located nearer to the equator than Nepal and is located in a lower altitude. Apart from it Nepal has the highest mountains in the world and these mountains resist the sun rays direct.
And as well as Nepal lies at high altitude than Sri Lanka.
Hope it will help :)