Question

niels bohrs theory was based on
evidence from a beam of particles that scattered after hitting thin gold foil.
evidence that an atom will actually emit colors when heated.
the experimental results of other scientists.
the effect of holding a magnet next to a beam of electrons.

Explanation:

Niels Bohr's atomic model was based on the fact that atoms emit discrete spectral lines (colors) when heated. This led him to propose quantized energy levels in an atom. The scattering of particles on gold - foil was related to Rutherford's model, and the other options are not the basis of Bohr's theory.

Answer:

evidence that an atom will actually emit colors when heated.