The image shows hydrogen's emission and absorption spectrum. This is compatible with which kind of model? (1 point)
O wave model because the spectrum is a continuum.
O wave model because the lines in the emission spectrum continue in the absorption spectrum.
particle model because the atom's electron absorbs and emits energy in discrete wavelengths.
O particle model because only this model can explain energy transfer.

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

Ithink it’s cancer risk