The statement "like planets orbiting the sun" best explains the Bohr's model. Niels Bohr postulated that electron revolve around the nucleus in specific orbitals which are quantized. These orbits are represented by the letters K.L.M,N. The maximum number of electrons in each orbit is determined by , where n is the number of the orbit. When an electron absorbs energy it moves to a higher orbit, and it moves to a lower orbit when it emits energy. This movement produces discrete spectra which explains the reason for quantized energy levels.
The Niels Bohr´s Model of the atom was arranged in a perfect center where the nucleus of the atom was located and then the electrons that surrounded the nucleus were orbiting the nucleus, it was thought to be always orbiting in perfect rounded shape orbits, like the planets around the sun, so that is why from the options the best suited would be planets orbiting the sun.
They are the same. If this is all happening on Earth, then the ball's acceleration is 9.8 m/s^2 in either case. That's the acceleration of gravity around here.
