What is the photoelectric effect?

What three conclusions were drawn from the experiment?

What is the threshold frequency?

What is meant by the work function of a metal?

What is line emission spectra?

What is an absorption spectrum?

How do fluorescent tubes produce visible light?

Which observations show light to have a "wave- like" character?

Which observations show light to have a "particle-like" character?

Which observations show electrons to have a "wave-like" character?

An electron and a proton are accelerated from rest by the same potential difference. Why will they have different wave lengths?