What forces must be balanced in the bohr model? a. electron attraction between electron and nucleus = centripetal force of the orbiting electronb. electrostatic repulsion of particles in the nucleus = electrostatic attraction between electrons and protonsc. electron attraction between electron and nucleus = electrostatic attraction between electrons and protonsd. none of the above

The correct answer is:
A. electron attraction between electron and nucleus = centripetal force of the orbiting electron

In fact, Bohr model depicts the atom as a nucleus surrounded by electrons in circular orbit around it, similar to the planets around the Sun. The centripetal force that keeps the electrons in circular motion around the nucles is provided by the electrostatic force between the electrons and the nucleus, so option A is the correct one.

The reflection of the candle in the concave mirror formed an upside-down virtual image that is smaller than the candle.in other words. the answer is the third option, c