A. Answer the following questions: 1. Who proposed the theory that electrons in

Question

A. Answer the following questions:

1. Who proposed the theory that electrons in an atom orbit in well-defined orbits around the nucleus?

2. The phenomenon when electrons are ejected from a metal surface if light of a high enough frequency hits the surface of the metal.

3. Why does hydrogen form a line spectrum rather than a continuous spectrum (you can actually answer this question by writing only three words)?

4. There is a fundamental limitation to just how precisely we can know both the position and momentum of a particle at a given time.  This principle is named after which scientist?

Explanation / Answer

ANSWER

1. This theory was proposedby Neils Bohr.

2. This phenomenon is called photoelectric effect.

3. Becaus ethe energy levels are quantised

4. This pronciple is named after Heisenberg.

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