A `He^(+)` ion is at rest and is in ground state. A necutron with intial kinetic energy`K` collides heads on with the `He^(+)` ion. Find minimum value of `K` so that there can be an inelastic collision between these two particals.

An H atom in ground state is moving with initial kinetic energy K .It collides head on with He ^(+) ion in ground state kept at rest but free to move. Find minimum value of K so that both the particles can excite to their first excited state.

A free hydrogen atom in its ground state is at rest. A neutron having kinetic energy k_(0) collides head one with the atom. Assume that mass of both neutron and the atom is same. (a) Find minimum value of k_(0) so that this collision can be inelastic. (b) If k_(0) = 25 eV , find the kinetic energy of neutron after collision if its excites the hydrogen atom to its second excited state. Take ionization energy of hydrogen atom in ground state to be 13.6 eV .

An electron of kinetic energy K collides elastically with a stationary hydrogen atom in the ground state. Then,

The ground state energy of hydrogen atom is -13.6 eV . The energy of second excited state of He^(+) ion in eV is

The ground state energy of hydrogen atom is -13.6 eV . The energy of second excited state of He^(+) ion in eV is

Two hydrogen atom in ground state are moving on opposite direction with the same speed and collide head on . The minimum kinetic energy of each hydrogen atom for the collision to be inelastic so that both the atoms are eccited is

What is the ratio of energy of the ground state of hydrogen atom and energy of the first excited state of He^+ ion (Z=2) ?

A particle moving with kinetic energy K makes a head on elastic collision with an identical particle at rest. Find the maximum elastic potential energy of the system during collision.