An electron collides elastically with a stationary hydrogen atom. the mass of the hydrogen atom is 1837 times that of the electron. assume all motion is along a straight line. what is the ratio of the kinetic energy of the hydrogen atom after the collision to that of the of the electron before the collision?

Explanation:

As we know that there is no external force on the system of hydrogen atom and electron so we will say momentum is conserved

so we will have

here we know that

now we have

also we know that

now we will have

now we need to find the ratio of kinetic energy of hydrogen atom with initial kinetic energy

so it is given as

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