Two hydrogen atoms are each initially in the ground state and moving toward each other with the same speed. They collide head on and end up with zero kinetic energy. As a result of the collision, each atom emits a photon with a wavelength of 97.25 nm (corresponding to a transition from the n = 4 to the n = 1 state). What was the speed of each atom before the collision (in m/s)? m/s