[領域] 大學普物                            (題目相關領域)

[來源] University Physics 12e  Hugh D. Young

       Chapter8 的第108習題

[題目]
        When two hydrogen atoms of mass m combine to form a diatomic hydrogen
molecule(H2), the potential energy of the system after they combine is -△,
where △ is a positive quanity called the binding energy of the molecule.

(a) Show that in a collision that involves only two hydrogen atoms, it is
impossible to form an H2 molecule because momentum and energy cannot
simultaneously be conserved.
(hint: if you can show this to be true in one frame of reference, then it is
true in all frames of reference. Can you see why?)

(b) An H2 molecule can be formed in a collision that involes three hydrogen
atoms. Suppose that before such a collision, each of the three atomes has
speed 1.00*10^3 m/s , and they are approaching at 120° angles so that at
any instant, the atoms lie at the corners of an equilateral triangle. Find
the speeds of the H2 molecule and of the single hydrogen atom that remains
after the collision. The binding energy of H2 is △=7.23*10^-19 J, and the
mass of the hydrogen atom is 1.67*10^-27 kg.

完全不知道如何下手...
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