According to the Schrodinger a particle is equivalent to:

The correct option is A

a wave

Schrodinger wave equation

1. Schrodinger wave equation describes the energy and position of the electron in space and time, considering the matter wave nature of the electron inside an atom.
2. Thus, according to Schrodinger, a smaller particle is equivalent to a wave.

Schrodinger's wave equation considers three factors:

1. Law of Conservation of Energy
2. Classical plane wave equation
3. Broglie's hypothesis of wave nature

Hence, option A is correct.